Little Endian said:
After having owned three imacs over the past 5 years I can speak with certainty that I would never buy them again. I now use a PowerMac and had I used one from the beggining I probably would have gone through just one over the past 4-5 years instead of going through three imacs. I now use a Dual 2.5Ghz G5 and this will last me 4-5 years for sure maybe even longer and in the meantime I get far superior performance over the imac G5 and have no desire for better. I know that had I purchased a top of the line 20" imac I would probably be itching for faster or better within 18 months or so and I probably would not keep the computer for longer than 2-3 years max. So either way I would spend about the same amount of money over 5-6 years except with the PowerMac I have greater speed and options for both today and tommorow.
Well some people are like that. There are people who have DP 2.5ghz machine now and when the 3ghz comes out they are going to want that, too. And lots of them will get it. On the other hand, there are people with the original flat screen iMacs still, and use them every day for what they need, who don't have any strong urge to update.
Something else to think about with "over buying" to future proof yourself...
A new 2.5ghz DP machine is $3000. Tack on $750 for display (that's a low estimate based on a Dell 20" widescreen), which could easily go up to $2000 if you went Apple brand stuff. But we will stick at $3750. Bump it up to $4000 for some more RAM and some software.
Ok, so that machine, as you state, probably good for 5 years, with some small updates here and there (more RAM, HDs, GPU, OS, etc).
On the other side of that is the 20" iMac. Perfectly capable for what you want to do with it now. $1900 + 250 for some RAM and software at time of purchase (same as we added for the PM). $2150 total, good for 2-3 years. For the sake of argument, lets aim low and say you want to upgrade in 2 years.
Apples price structure generally keeps products at the same cost, but they get faster and more feature full. So in 2 years it's safe to say that there will be a a $2000 machine that will do what you want without to much issue. Even if you just buy that machine outright you will still be at the cost of having just the PM, but if you don't need two computers you can always sell the old one. In two years a 20" iMac, in my guess, will still fetch $1200, but we will aim low again, and say you sell it for $1000.
So you're new iMac and it's 2 year lifespan cost you $1000. You're up to $3000 total for 4 years of usable machine. Still $1000 less than the PM. You pay a price to get the cutting edge equipment now, but if upgrade frequently to the current "midrange" you can save a lot fo money, as long as you are not conerned about having the latest and greatest.
That said, the PM still tempts me, too. I like to game a little bit, so upgrable video cards are definately tempting. I can always add external HDs for just a little more than an internal one (160gbs of storage is $100 vs. $130 for internal/external... not a HUGE deal, and you get the added portability). 2gbs of RAM is probably all I will need, before my next upgrade comes along anyways.
Also, as my only reason for wanting to upgrade the GPU is gaming, I can build a capable, and suprisingly small (not mini of course, but microATX is not bad sizewise) PC, complete with KVM, for about $100 more than a high end video card for a PM would cost.
Sorry I went so long on this... btw, crucial, from all accounts is a good place to get Mac memory. You can buy Crucial brand RAM from newegg.com for less than at Crucial, but I am not sure about their international shipping policies.
Rob