Hdmi for winxp tower

I have a desktop PC in my room and want to hook it up to my television using HDMI. My dell laptop has a sweet HDMI out that I can connect to the TV, and in HDMI mode it looks great. I'd like to be able to do the same with my desktop.

Stats are
Homebuilt PC with
Gigabyte GA-P35-DS3L
Geforce 7600 GSOC
Windows XP SP2


Can I get another video card with HDMI out, economically? Or do I need to swap the one I have?
Also, how does XP handle HDMI video and sound? It's a little flaky in Vista (the laptop), but managable.
I took a look around and couldn't see where this had been asked before, sorry if it was.

David

thought about that, but the quality of the video signal between DVI and HDMI seemed different to me when eyeballing them. Would prefer HDMI for future proofing to.