Wait, wait... I'm confused. Am I being trolled here? Whatever, I'll bite.
That processor does not even come close to DOUBLE the performance of the 15" macbook pro that the OP is considering, it doesn't even match the performance of the high end 27" iMac
You DO realize what's inside that "high end" iMac right? It's a core i5 2400. You're telling me a 2500k with unlocked multipliers is a WEAKER processor, than the cheaper 2400? Nevermind the fact that the 2500k already runs at a higher clock on default than the 2400, but that the 2500k are great processors that are made to be overclocked (heck, that's pretty much what the k stands for). Again, 4.0ghz with a stock cooler is no slouch. 4.5, even 5 ghz with a $20 fan and a repaste.
Results? Not pretty.
Macbook Pro:
http://3dmark.com/search?resultTypeId=232&linkedDisplayAdapters=0&cpuModelId=1207&chipsetId=664
iMac high end 3.1 with 6970m:
http://3dmark.com/search?resultTypeId=232&linkedDisplayAdapters=0&cpuModelId=1196&chipsetId=670
2500k with 560 GTX:
http://3dmark.com/search?resultTypeId=232&linkedDisplayAdapters=0&cpuModelId=1199&chipsetId=676
3700 vs 7500. That's the $850 PC doubling up on the HIGH END iMac, and quadrupling the MBP.
The low end mac is nowhere near those specs. But since you probably wouldn't know better, drop processor down to AMD Phenom II 955 @ 3.2 quad. Save $100. Drop mobo down to Gigabyte 760G Micro ATX; save $55. Drop video card down to Sapphire 5830; save $75. Drop power supply down to a 520W model; save $25. Drop case down to an Rosewill; save $25. Cut RAM in half; save $35. And if I wanted to be anal, dropping the HDD down to a 500 GB model saves another $15. Total cost: 115+110+65+40+40+60+50=480 Doesn't that mean... yes. It does. It's worth less than $500. But just to be clear, the iMac's 2400S (2.5 i5) is about 20% than the AMD, I felt it's a horrible purchase. With the 2400S, you're getting horrible value for what you're paying for (Apple makes odd hardware decisions pretty often... e.g. 6490m in the base MBP that millions have complained about). So really, I have the option to crush the 2400s for $100, but nah, you can keep it. On the flip side, the desktop 5830 is still much more powerful than iMac's MOBILE 6750m (about 2.5x the 3DMark GPU score). So the overall scores of the resulting two machines? Not pretty.
Here's the base iMac:
http://3dmark.com/search?resultTypeId=232&linkedDisplayAdapters=0&cpuModelId=1197&chipsetId=664
Here's the weaker AMD + far superior 5830:
http://3dmark.com/search?resultTypeId=232&linkedDisplayAdapters=0&cpuModelId=917&chipsetId=611
Btw, if you think the high HIGH end MBPs fare better, you're sadly mistaken:
iMacs with i7s:
http://3dmark.com/search?resultTypeId=232&linkedDisplayAdapters=0&cpuModelId=1202&chipsetId=670
About 10% higher than the 3.1 i5s, which sounds about right.
I understand benchmarks aren't everything, but 1300 vs 5400-5800? Sorry, but there's no case to be had here. Oh, and this $500 POS hardware is still 30% better than the high-end iMacs.
Yes, these are 3DMark scores, which takes into account both the processors and the video card. The video card is really where it makes up ground, but the processors are no slouches. The idea here is that the desktops OC real real easily, and the Sandy Bridges, especially with the unlocked multipliers are built for OC-ing.
So, here are some PCMark scores to ease your pain; do note MBP posted some "glitched" scores that could not be replicated:
High i7 iMac (10k):
http://3dmark.com/search?resultTypeId=18&linkedDisplayAdapters=0&cpuModelId=1202&chipsetId=670
High i5 iMac (8.5k):
http://3dmark.com/search?resultTypeId=18&linkedDisplayAdapters=0&cpuModelId=1196&chipsetId=670
MBP 2.2 (8k):
http://3dmark.com/search?resultTypeId=18&linkedDisplayAdapters=0&cpuModelId=1207&chipsetId=664
2500k @ 4.4ghz (14.5k):
http://3dmark.com/search?resultTypeId=18&linkedDisplayAdapters=0&cpuModelId=1199&chipsetId=676
Garbage AMD chip (7k):
http://3dmark.com/search?resultTypeId=18&linkedDisplayAdapters=0&cpuModelId=917&chipsetId=611
I've definitely not only proved my claim, I've surpassed my claim.
Keyboard, mouse, that was the best you could come up with?
Windows? Oh please. There's other OSes (Linux). Not to mention, engineering students get W7 for free.
I never mentioned the inclusion of monitors. I specifically mentioned the EXCLUSION of them though. But if you're nitpicking, an IPS sets you back what, 250? 300?
I'm not trying to match everything; some of the stuff Apple throws at you that most consumers don't need. Honestly, do you expect me to match the iMac case too? The paintjob? What about the Apple logo? I'm just covering very broad hardware. Performance was the original claim, not styling, and that's an argument that Macs simply cannot win. You asked, I provided. An 800 dollar machine that performs at twice (or 4x if we're going by 3Dmark) that of the MBP, and matches (or doubles if we're going by 3Dmark) that of the high end iMacs. Heck, even the $500 dollar machine surpasses that of either. Specs matched, point proven, case closed. "fail"
The thing is, I don't see why you're even bothering to argue with me on this one. No one buys Macs for the sake of being cost effective. The spec sheet is way down at #4 or #5 on their priority list, with the first 3 being build quality, design, and a mix of ego/brand name/wanting to fit in. This was step one for me to transition from PCs to Macs. I've accepted it, it's perfectly ok to know I'm getting horrible performance for what I'm paying for; that's not why I bought it. I know that, so it doesn't bother me. If you're happy with your HPs with the same 2720 and a better 6770 at 60% the price, ok, that's cool, I'm just as happy with my MBP.
The way I see it, if people force their "cost-effective" argument on me, it's better to compare apples to apples (pun intended). A MBP, at least to me, is in the same class as a Thinkpad W520 and Dell Precision M4600 [and whatever Sony's come up with; their 15-inch line is very lacking]. Great build quality, above average performance, the focus was clearly on the materials and worksmanship (sort of!); and superior non-consumer line customer service. The focus wasn't to squeeze out every last clock cycle of a chip to build a laptop that WILL overheat/run into problems some 18-24 months down the line, simply because portability and performance are two paths going in opposite directions. And really, I'm paying only a ~10-15% premium over them and for that, I get "premium styling", as well as membership to a very egotistical and ignorant community, which I've come to appreciate.
That's what a Mac is. So this "Macs are cost efficient too! you just need to match the smaller things!" argument isn't going anywhere. PCs, especially when your letting me have my pick of parts, lets me manipulate things to be in my favor every time. Macs were never about that, PCs, on the other hand, were founded on that concept; so why even bother?
If you were trolling me, then consider yourself successful.