New Graphics required !! Help..

Hi there,

I want to upgrade my graphics card to anything from AMD over AMD Radeon 6670 and over it.. Any card with HD Gaming.. I need to know what will I need to upgrade along with this and the price for that..

My present configuration is:

Processor: intel Core 2 Duo 2.8 GHz
Slot: PCI, PCI-E x16
RAM : 2 GB
OS: Windows 7 Ultimate
PSU: 220 Watts

Thank you pals..