I went with this one.
http://www.ebay.com/itm/AirLift-by-Viai ... 09&vxp=mtrIt is the exact same as the Viair 400P Brand (
http://www.viaircorp.com/400P.html)
Will inflate a 31" tire from ~15-~35PSI in about 1:15-1:30. These are my calculations.
They say max time before you need to turn it off is 40 minutes, so at about 5-6 minutes to fill four tires, you can fill at least four trucks before you need to give it a break.
It is Cheaper, and it comes with a couple extra accessories. It comes with a handy bag to store/transport everything with.
It is quite nice, Enjoy!

EDIT: Of course, just like everything else, go with what you can afford and how and how often you will use it.
I burnt out a "cheaper" air compressor because I was using it 1-2 times a week all summer. It also took about twenty plus minutes to fill up my truck versus the replacement which take 5-6 minutes.