My only advice as a former desert rat is that the swamp cooler won't cut it for controlling the temp of your beer, you need to do something to keep the temps down in the high 60's when fermenting. My solution was "wait for autumn" but if you have the money and space you can do better with a...
The O2 and stone method is probably better but here's what I do:
Dedicate a bit of hose to this: Siphon cooled wort from brew pot to fermenter. Put a small hole in the hose so that the siphon system leaks in a little air. If you are doing extract brewing you can run the rest of the water...