i have both an alita and a jehmco. I use an AL 80 to power my fishroom, no complaints at all about the pump. Its been running like a champ since the day I installed it a few years ago.
I picked up Ali's jehmco from him, where he had built a box and was keepign it outside (nice for noise reduction). its this:
DAPPH30
Diaphragm Air Pump, 40 LPM @ 1.5 PSI
20-35 outlets (conservatively rated)
Durable yet economical plastic housing diaphragm pump can be used for outdoor locations for Pond use or Fish Room applications
$119.95