So, you say you can find me an 800$ laptop better specced than the MBP? OK, so find me one that has better specs than the MBP in a similar shell with similar build-quality and software that is also on par. Just to save you the actual search, the closest machine you will find is almost the same price as the MBP (I think it might have been 250$ or so cheaper) and it came with Windows. Now, please, remind me what the main reason is for why we buy Macs? (no, not the "cool" factor) It's the software! So I think most of us would rather use the 250$ and get the better software together with a thinner and lighter laptop.
Actually - no. I think we can sweep this sort of fanboy talk aside.
My XPS 16 is about a thousand dollars cheaper in a very similar performance config, similar weight class,
replaceable batteries (just under 4 hour power saving life with the 9-cell and GPU since it has no IGP, as opposed to the just under 6 hour power saving life of the 17-inch MBP using the IGP) and with the Sony Imagination Suite providing iLife-and-sometimes-beyond capabilities. The XPS is also better built for a life of roading than the delicate MBP (My XPS shuts with a straight body-lid line for starters. Something my 17-inch MBP's seem unable to manage out of the box).
Right now:
The XPS 16 is $2,846 with a further $100 gift card for a 2.9/4/500, HD RGBLED display, Bluray, MS Office H&S, Sony IS, 3-year onsite.
The MBP 17 is $3,867 for a 2.9/4/320, LED display, DVD, MS Office H&S, iLife, 3-year offsite.
Let's not kid ourselves about this 'value' quotient, shall we? Apple gear isn't grossly overpriced if you consider the whole (and leave out 'actual build quality and reliability' as value factors) but it's hardly competitive. What could you buy for a thousand bucks to extend your productivity in almost any market? Quite a lot I think...