What graphics card would you recommend?

http://h10010.www1.hp.com/wwpc/ca/en/ho/WF06b/12132708-12133156-12133158-12133158-12133158-80230858-80444148.html

I have the above machine and would like to upgrade to a new graphics card. What would be a good choice?

P.S. Windows 7 Ultimate, not Vista.

Thanks!

I would like to suggest you to going with vista is a good choice as per my experience.

And what does that have to do with a new graphics card?

I think softechnet misread the question. In order to suggest a decent graphics card, we’ll need to know a few more things…
Do you plan on playing new, heavy games? How many watts does your power supply have? I tried searching everywhere as to how much wattage your power supply has, but it’s just aggregation to see that HP would ignore this information on there websites and manual.