I also have a 9600 GT and its great however i recently built another machine and in that i put a 610 GT and its also great. Not OOTB however just need to add the device id to the nVidea kext and you are away.
Just tried again booting with -x -v and it stops here - any clues anyone?
This is just with the onboard video all other cards are outhttp://www.insanelymac.com/forum/uploads/monthly_01_2013/post-841024-0-63700500-1357330256_thumb.jpg