Simple as that. I would spend a good $800 just to get eyefinity with 3d on all monitors. So, does NVIDIA have thier own version of "eyefinity" like AMD, and is triple monitor eyefinity 3D possible yet? I will be getting the GTX 680 on launch day, March 22nd or 3rd.
I'd recommend just getting a single 3D monitor first and make sure you can enjoy 3D vision on a single monitor. If you were to go for 3D surround, you are going to need monitor performance to handle 3 monitor at 60 her per eye, and low frame rates with 3D is the leading cause of the headaches people complain about with 3D vision.
As someone who easily feels motion sickness when gaming, I find that if you can have high FPS, I don't feel sick. The same goes for 3D vision.