Ahh okay, Hybrid sli, helps if you used the right word but doesnt matter. Anyway, Hybrid SLi is only available to some motherboards:
Hybrid SLIŽ Enabled Motherboards
* GeForce 8200 mGPU
* nForce 780a
* nForce 750a
* nForce 730a (GeForce Boost only)
* (Coming soon!)
So just forget SLI for now. Your best bet is to just get the 7600GS if you just want a family desktop. Or if you want to game (going upto the higher end cards), a 8800GS/9600GT/HD3850.