Would the gtx 560ti be able to run dual screen with this set up (on its own)? If so how well? Would it be able to play 3d on one screen? and what other cards would be able to?
500GB Western Digital Caviar Blue 3.5" Hard Disk Drive
4GB Corsair XMS3 1333MHz DDR3 Dual Channel Memory Kit
AMD Phenom II X6 1055T 2.8GHz Hexa Core Processor
OCZ StealthXstream II 500W Power Supply
Gigabyte GA-MA78LMT-US2HAM3 AM3 Motherboard
Cooler Master Elite 430 Black Tower Case
Sony DDU-1681S DVD-ROM Drive 18x SATA Internal
Windows 7 ultimate 64 bit
Yes that card will deliver dual screen graphics easily (I ran a GTX460 (lesser card) dual screen every day). With Nvidia's 3D vision you can run 3D with an applicable monitor. Any card in that price range will be fine (6850, 6950, 550Ti etc.. + the new gen)
NOTE: you can not game over 2 screens with vista or 7, the drivers do not support it anymore. you either need 3 screens with a capable card or xp, but that will only play older games lik3 L4D2 over 2 screens.