P35 equivalent for AMD is obviously the latest AMD 770 and 790 AMD2+ chipset series. As far as I know, they've gotten great reviews.
As for drivers. Personally I would never again buy another motherboard using Nvidia chipset, they had (still have?) awful drivers and a ton of other issues. As for video card drivers, can't say much about nvidia because I haven't owned one since GF3, but ATI drivers have been solid on my systems since 9x00 series. I have to admit thought, that the pre-9x00 series drivers were awful.