Need help choosing CPU and GPU

[epexy]

I have access to the following components and prices:

Intel Core 2 Duo E7400 $152
Intel Core 2 Quad Q8200 $202
Intel Core 2 Duo E7400 $225
Intel Core 2 Quad Q6600 $245

SAPPHIRE Radeon HD 4850 512MB $159
SAPPHIRE Radeon HD 4850 1 GB $179
XFX GeForce GTS 250 512MB $175
XFX GeForce GTS 250 512MB $199

I'm planning on use this mostly for gaming, and I'm not thinking on going over 1600x1200 since my monitor doesnt support more than that.

What do you guys suggest?

 

[Duesouth]

intel core 2 quad q9550s
go with a ati, sapphire, msi, does not matter still the same backbone to it,
radeon hd 4870 1 gig gdr5 minimum

got this setup and it is perfect for me.