Hmm, to choose the lesser of two evils. Difficult choice. To tell you the truth, it depends on the processor you get. VIA is good for intel. They have nice driver updates regularly. Its safe to say if something is wrong with the drivers it will be fixed quickly.
For AMD, I'd reccomend ALI. Just don't get the ASUS A7A266 motherboard. While ASUS makes great motherboards, everyone has to screw up sometime and this was theirs.