I'm using the new Nvidia driver 181.20, which was released this month. I don't have any issues with it. In fact, my Flight Sim X seems to be more stable. I only tried AHII once, had no problems. I didn't notice any great improvement or degredation with this game.
I am using a very old chip-set though, Geforce 6150se nforce 430. It would be nice to have a site that has a listing for the optimal driver for any video card, as stated by Moot. That way I could go back to older drivers that may work better with my chip-set.
Coogan