Unless gaming ranks low on your list of priorities, any graphics card you can get for 2k will be a severe mismatch for the rest of your computer.
You can get a SiS 315 card within your budget, and probably a second-hand FX5200 or a Radeon 9200. These cards will be OK for things like surfing, playing movies, video editing, office work. But for gaming these are low-end cards and the power of your AMD64 CPU will be largely wasted.
If you're going to use your computer mainly for non-gaming apps, perhaps with just some occasional casual gaming, I guess these cards will do.