1. HD7970 would Crossfire, SLI is what NVidia calls it
2. ASUS, MSI, Gigabyte, ASrock Z68 platform will be a good MB option
3. I don't see any bottlenecks in your future
4. I'd imagine this system would be very solid for 3-5years
5. If you like NVidia you should wait and see how they perform when they are released
whoops srry cause i rite now i'm using an sli setup and i'm acustom to calling and dual gpu solution 'sli'