1 more thing, the GTX460 does not allow tripple (3) card SLI, this card is limited to 2card SLI configurations, this is a hardware limit enforced by Nvidia
I think you got that way wrong!?
nVidia says 3 way SLI is supported: http://www.nvidia.com/object/3d-vision-surround-technology.html
Old Launch info (3way on GT400 only, maybe on all supported cards now?):
http://www.anandtech.com/show/3793/nvidia-launches-3d-vision-surround
And again, more old info: http://www.hardocp.com/article/2010/06/29/nvidia_3d_vision_surround_experience/
NVIDIA 3-Way SLI and NVIDIA Quad SLI are both supported in NV Surround and NV Vision Surround modes in this BETA driver with GTX 400 series cards; GTX 200 do not support 3-Way or Quad SLI in this BETA or first WHQL release, but seems like it will be added eventually.
It looks like right now 3way SLI is supported on GT200 and GT400.
3) Need 2 or more Nvidia GTX 400 series cards in SLI mode (or 1 GTX 295)
Thats incorrect, GTX260 and above are supported too, its not a GT400 series thing.