I'm currently eyeing a lappy from Asus and it offers two models: one with a T6500 CPU (950$) and the other with a P8700 (1150$). I know the latter is faster, less power-hungry and produces less heat but is it worth the extra money? My budget is about 1000$ and can always dish out a bit more.
Now you're wondering what I'll do with the laptop. I'm a casual gamer and my main games are Guild Wars (duh), CS:S and TF2. Though, I'll probably play some CoD4 and Mass Effect (surely the most intensive games I'll play for the next couple of years). With uni, I won't play much anyway.
Other than games, I frequently use Photoshop. I also work with IDEs for my software classes (Visual Studio) for the usual debugging and compiling/decompiling. I might do some desktop virtualization and Compiz/Fusion on Linux.
Do those things require a P8700 or is the T6500 will do just fine? I want my lappy to last through my four years of uni and I'm not sure if the T6500 will have enough power juice.

Thanks for your suggestion!