PCI Express Video Card for 275w PSU?

Hi There

So I recently acquired a Dell XPS 210 from a Thrift Store and I just got the VGA Cable to hook it up to my HDTV. I want to upgrade to a PCIe x16 Video Card. But I wouldn't know which one to get that'll play nice with a 275w PSU and that'll do Okay-ish for XP Gaming (My Tower currently has a Intel G965 Chip in it). If anyone can help me out with this. That would be Great :D