Thought I'd add my 2c.
I bought an 8200-based mobo for a MythTV system, and as of driver 177.80, I consider it to be junk.
I consider it so for two reasons: first, because the 2d acceleration is so slow I can literally see the GUI draw itself in a nice, old-school top-to-bottom wipe, and second, because using sync to vblank for video drives xorg up to 100% on one CPU core, despite the old "UseEvents" "True" trick, which doesn't help.
I'm not trying to be a hater. Nvidia have earned many of my dollars, but the 8200 is just not working right for me. There are several threads on nvnews.net on these issues.
I'm not sure whether to go get a $30 8400GS, wait and hope they fix their drivers, or jump ship. I don't want more heat in my little case, though, and I do eventually want to use VDPAU, so...I'm probably stuck with waiting.
