http://www.jehmco.com/html/central_air_pumps.htmlMy take on options:
Linear air pumps:
Pro: Quiet, efficient, minimal maintenance (occasional air filter change - will be required for any of these options)
Con: Expensive
Diaphragm Air Pumps:
Pro: Economical and effective
Con: Require more maintenance - occassional diaphragm replacement
Blowers:
Pro: Moves a LOT of air
Con: Not as efficient, slightly more maintenance than the linear piston, expensive
In all cases you want something sized to your setup - if it produces more air than you can use, you'll need to bleed pressure to prevent excessive back pressure from ruining the pump.
I've got the smallest linear piston model (
http://www.jehmco.com/html/lph26.html). I'm fully impressed with it, but sometimes wish I had the next larger model since I'm maxing it out. Admittedly I purchased mine second-hand, which made it much easier to work out the numbers to justify moving from my HOB army to an air-driven setup.