You may want to read the reviews of the mother board
here before you go and purchase one. I would recommend that you read all of the reviews not just the ones with 4 stars. 24% of the reviews were average to very poor. Mostly due to D.O.A. issues and failures within the first 30 days and the poor customer support they received from Gigabyte. 24% may not seem like a bad number but in my world that's one out of four customers being down or upset. That's an unacceptable number.
I would put as many fans in the system as the case can handle. One case, cpu, power supply and gpu fan won't be enough. 120 mm variable speed case fans would work great if the case you are looking at will allow that size of fan to be installed.
For a power supply I'd recommend at least 650 watts. 1000 watts if you can afford it. Your video card and cpu will use 200 or so watts by them selves. That way you won't have to worry about an add on card down the road over tasking the power supply.
I kind of slammed the mother board a little bit I guess but that's the heart of the system and the most pain in the butt piece to have to replace so doing some research now could save you a lot of frustration later.