[QUOTE=DJ B;2147585]if i ever get the paper to build a system in the future one of the things… can i run a pny 8600gt OC in sli?[/QUOTE]More important is why you would want to do that?
An SLI motherboard is going to be more expensive than an non-SLI motherboard.
Right now it would be cheaper to go with a single ATI-4850 than twin 8600s.
Of course it you are talking about the distant future nothing that is available today matters because new better stuff will be available in the future.
This is a good place to look for graphics card advice: