if you really want the best video card go for a flashed Radeon 9800 with 256MB VRAM or a flashed GeForce 7 series card.

the 9800 gets pretty hot compared to the geforce cards. so if i had to choose again I would go GeForce this time. had a radeon 9800 in my MDD back in the days and it showed symptoms of overheating when playing games for too long on really hot days.