I've run version 1 and 1.1 on boards. Unless its a crap board, you'll be ok. Gigabyte is one of the big boys and this CPU release has been eagerly awaited. I don't think you'll have to worry about Gigabyte dropping the ball on this. That being said, buy from a place with a good return policy.
The case you picked out looks to fit both just fine. However if you're going off the Manufactures recommended PSU they call for a 750watt.