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FYI... you don't want to run two fans on those controllers, not unless they are small fans. Two 16" fans on one 30/40amp relay is way too close to the rated duty cycle when the relay kicks in, plus you don't need both fans coming on at once just for A/C. Use two controllers, both triggered by slightly different temps, and the high temp fan also triggered by the A/C. Frankly, I just don't trust the Derale and Hayden controllers, I've heard way too many reports of problems and have personally seen one catch fire after months of working just fine.
Go cheap if you like, but at least get some redundancy so you don't get stuck on a hot day if a controller goes out on you. Personally, I forked out for one of the best controllers on the market and have been extremely happy. It only runs the fans as fast as they need it, so the fans are quiet. When they run at 10-20% speed (which is all they need for most of my non-highway driving) you can't even hear them.
Personally, I've never understood paying thousands for a truck and then nickle-diming on accessories.
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