I'm planning on using a ssd as primary, and a hdd as a secondary. At the moment no SLI, but not about to rule it out for the future. What kind of extra features are you talking about in regards to the expensive boards? Like the extra utilities?
Extra features would be extra SATA 3 ports, PCI Express slots, USB 3 ports etc. Mostly storage options. The cheapest available (Z77 V-LX) has more than enough features to begin with. I recommend that.