Typically the biggest thing to look for is tank size. Although you do need probably at least 3-4 hp to fill a tank in a reasonable amount of time, the bigger the tank the better. I have a 6hp, 60 gallon tank that i bought new at home depot for $650. It runs everything you could possibly attach and more.
Not sure what you may be able to find used but as long as your not worried about it being portable get the biggest tank you can find. I know of guys that have actually used smaller compressors (2 HP) and attach a couple of larger tanks in series. Seemed to work well for them.
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