I'm looking pretty hard at the base 15". That with the hi-res matte screen is probably about the max I would be willing to part with. I know some people are dissapointed, but I think for my needs (graphic design, web dev, a little music-making just for fun) it will be fine. I have been itching for a mobile machine for awhile (the blackbook in my sig got sold to my roommate like 3 mo. after I bought it).
Not going to lie, the cost is a lot considering my budget, but I just don't think I will get as much use out of a Windows machine, though I am looking forward to playing with Windows 7 at some point. I have Vista on my iMac...definitely useful. Anyway, I have a freelance gig coming to a close at the end of this month that will pay for a new MBP. To save or to spend? That is my eternal struggle.
if i were to buy one, which i won't, the low 15" with high res display is definitely the sweet spot. the benefits of extra vram and i7 would be unnoticeable in real life applications. this is actually surprising from apple, very little to differentiate the different models.