Need some help with my parts list i feel like i'm missing something.

[Toolman90]

Cpu-intel core i7 2006k
Mobo- Asus maximus IV Extreme
Cooler- Frio ock
Ram- Corsair Cmz16GX3m4a1600c9 Vengence 16GB
Gpu- Diamond amd radeon HD 6990
Hardrive - WD Caviar 2 TB
Optic drive- Lite on black 24x
Sound card- soundblaster X-Fi titanium HD
PSU- Cooler master silent pro gold 1200w
Case-Colossus Venom edition
i really feel like i'm overlooking come compatibility issue but i cant find what it is.

[RickyTick]

For a complete system, you're missing mouse, keyboard, monitor, speakers or headset, and an operating system (Windows 7 64-bit).

Everything else looks good.