VIAIR 400P-Automatic:
http://www.amazon.com/VIAIR-400P-Aut...5775400&sr=1-1
http://www.viaircorp.com/OffRoad/400P-A.html
$250, fills up 35" tires from 15 to 30 psi in 2 min 20 seconds and has automatic shutoff.

^^I kind of like that...