Cool, I seldom read about other modelers using CO2 tanks lately, I have one as well. I think a piston-type compressor like others have just mentioned will be more suitable and you don't have to worry about the compressed air cans suddenly running out in the middle of a spray session. Also, the compressor should last longer than your modeling career if you take care of it. The next step up from a regular compressor might be a silent-type unit. They're more expensive, approx. $400.00 from brands such as Badger, Iwata, etc.. But the they're practacally silent running, actually you'll only hear a humming, and no load rattle.
I've moved on to a Badger Millionair Silent compressor and I can airbrush all night long witout waking the wife or the kid! So for now, like mentioned above..ditch the cans and get yourself an air compressor. I used a Badger 180-11 compressor wth a foot switch for 10 years and I swore by it. I sold it to a buddy 8 years ago, and he still uses it to this day. Also, one other tip while you search for your airsource. That Paache-H generally sprays better at higher regulated psi settings. You might want to narror your search for a unit that produces psi output of over 30 (running psi). This way you will insure that you have adequate air for that Paasche and gives you a little room to regulate a wider variety of psi settings.
Greg Williams
Owner/ Manager
Modern Hobbies LLC
Indianapolis, IN.
IPMS #44084