what are your current specs? does your motherboard support pcie? any new graphics card available supports pixel shader 2.0, but it doesnt mean it will do whatever it is your trying to do with it.
Pixel Shader 2.0...
What year is it?
So basically they've been saying if you buy any "current" generation card you'll be fine. But we need to know a lot more like your motherboard, PSU, and maybe things like your CPU, RAM, and resolution if we can suggest a good card for you.
I believe we are now on shader 5.0/6.0
Not six. Pretty sure we are on 4. Five maybe.
6xxx and 5xx are pixel shader 5.0, DX 11.1 supports pixel shader 6.0 which I'd assume will be in the new 7xxx series and Kepler.