Well Ryan funny you should mention that....
if you don't want to spend a lot of money and a little noise every 15 min or so isn't gonna bother you you can go to Lowe's and get their 2.0 gal tank compressor for about $70 dollars... I have one and it works good... comes with the regulator etc... all you need is a water trap and you're set! (especially if you buy the Anthem/Crescendo set with the hoses) typically what I do is fill her up and turn the switch off and it's good for an easy 20 or so minutes of brushing... (total, so if you spray a little, pause etc... it will last a lot longer) Turn her on, let it run until full then repeat... usually I refill after spraying a coat because I would just be sitting there idle anyway...
If you want a quieter compressor, I am sure someone else can recommend a good modelling type compressor... I have seen some names tossed around but haven't really paid attention because I am happy with the one I have... (the lowes model) If you have kids or do your modelling later at night you might consider one of these...