I don't know what is "best" for AH.
With video cards, go with what you like and what works for you is about the best suggestion I would give.
I would caution taking a very slow approach to the current NVidia FX solutions. NVidia cannot get WHQL certification due to none of the FX line being able to pass DX9 qualifications without choking the performance of the cards to unreasonable levels.
NV35 should change that. So for NVidia solutions, I would say wait until NV35 is out and pass on the current NV30,31,34 (FX 5xxx) solutions.
Also, I would avoid usinig any of the 4x.xx drivers for NVidia cards. They really do have some problems. 30.82's seem to be the most stable of the lot.
For ATI, you really should be using the Cat 3.2 drivers they just released.