Need help making a decision.

So I've decided to sell my Macbook because of it's dismal 3D performance. I have a guy coming to look at it today and if I had to guess I'll get between $700 and $800.

Now the decision. My friend just purchased a unibody MBP and he's offering to sell me his old 15" aluminum MBP for $950.
Specs:
2.16GHz C2d
4 gigs of ram
120 gig HDD
superdrive
X1650xt
4 months left on applecare
New screen, case, and superdrive

Now, I could get a new unibody 13" MBP (the base 2.26 GHz one) for $1099 with my student discount. Which do you all suggest? How does the 128mb x1650xt compare to the Geforce 9400m?

Thanks all, any input is appreciated. I'm not planning on doing heavy gaming, just a little WoW here and there (which my current MB can barely do).

Well just as a spec. comparison the new MBP beats the old one or ties it. And by the looks of it, it is no problem for you to get a new MBP for just a little more. So what screen size do you need is the question. But also the new MBP has some more features. Personally, I'd go for the 13 inch Apple MacBook Pro.

Yeah, if I go for a new Pro, it'd be a 13" one. The 15" is a bit out of my price range.

Here are the specs for my friend's MBP. I'm kind of curious how the dedicated X1600 stacks up to the 9400M.

Apple MacBook Pro "Core 2 Duo" 2.16 15" Specs (Late 2006 - MA609LL) @ EveryMac.com