New
#11
I haven't read everything, sorry, but I just want to be informative because this might be related to your problem.
Ever since Patch 4.1, a lot of players were having driver issues with WoW. This is actually a known bug and Blizzard is working on it. I, for one, have a GTX 260m and have been having issues with WoW as well such as screen going blank and my OS having to recover my graphics driver. Other players have reported texture errors, permanent black screens, and many more.
As for your last question, you most likely don't need 3D vision unless you have a 3D capable monitor. PhysX is very good and I advise you get it, as a lot of games make use of it and getting it will provide better quality Physics with lesser resources from your GPU. :)