I prefer Nvidia than ATI. Nvidia have always been a better choice for quality in my opinion as I've had some issues with an ATI card. And the GTX 570 could've been good too but its was a bit more expensive and I wanted the 2GB memory.
I got a copy of Windows 7 Home Premium X64
You can see my final choices on my last post. You can also see a screen I may buy. My options are this 21.5" widescreen or a 19" screen my friend can sell me for fews dollars.