I just ordered this Radeon 9800 Pro 128MB from NewEgg.com for $301. I'm also adding on a Thermaltake "Blue Orb" GPU cooler for $8. Just be sure you have the Power Supply to support all your stuff. A good 350W or 400W power supply is not all that spendy. I like the Allied ATX400P4 w/ Two Fans for $30.
Also, for any Graphics card, unless your case has a fan (or 2) that blows air over your PCI/AGP slot area I would suggest a PCI slot fan to blow air right onto your AGP card. You can get them for as little as 5$.
Also, for any Graphics card, unless your case has a fan (or 2) that blows air over your PCI/AGP slot area I would suggest a PCI slot fan to blow air right onto your AGP card. You can get them for as little as 5$.