Maximum PC

Hey folks...

I'm planning out my first PC build and I have assembled a parts list that I'm pretty happy with (I think), and I'd like some advice/critique on where I should potentially upgrade or downgrade in relation to price to performance ratio.

I'm mostly using this PC to do two things. 1) Play games at the highest possible settings I can achieve for the money and 2) Just browse the internet and listen to music.

I already have a 1080p monitor so that part is taken care of, here's the rest of the build:

CPU Intel Core i5-2500K 3.3GHz Quad-Core $199.99
Motherboard ASRock Z77 Pro3 ATX LGA1155 $102.55
Memory Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 $44.99
Storage Samsung Spinpoint F3 1TB 3.5" 7200RPM $88.98
Video Card Sapphire Radeon HD 6870 1GB $164.98
Case Cooler Master HAF 912 ATX Mid Tower $49.49
Power Supply Corsair 600W ATX12V $69.99
Optical Drive Samsung SH-222BB/BEBE DVD/CD Writer $14.99
Operating System Microsoft Windows 7 Home Premium SP1 (64-bit) $89.98

The only place I'm potentially considering an upgrade is in the GPU from the 6870 to the 6950...

Any thoughts on that?

Thanks in advance...