If you do plan on going to a SLI set up, it would probably be easier to get a motherboard capable of it now rather than later and save the $ and hassle of reinstalling windows. From what I have heard the NVidia Nforce 750i chipset is very good and stable. Link has a list of boards with that chipset. Also considering how new your CPU is, your motherboard might need a BIOS update.
Check out Gomez Peer
on how to make your PC work for you. Referred by dark2099 please!
Mini Rig: Biostar TP67XE / i5 2500k / Corsair H55 / 2x4GB PNY / XFX 7770 / Corsair CX500M / Win 8 64 bit / Thermaltake V9 Blackwidow