i recently installed a hardwood floor and bought a $99 air compressor to run the nailer and stapler. i wish i would have investigated a little more as it cannot run air ratchets or impact guns. i was thrown off by the fact that the air compressors that would run such tools were well over $300 at Home Depot. A week later I got a catalog in the mail from Harbor Freight tools. Yeah they're kind of crappy...ok really crappy, but their air compressors that run air tools were under $200. can't really speak to the quality of them, but i've purchased a few things there and have had decent luck w/ durability.
my tip, make sure you get the right air compressor for the job. find the air tools you want (matco and ingersoll-rand ones are nice) and take note of the air consumption, measured in CFM and pick a compressor that exceeds the rating of your most air-hungry tool.
also, i enrolled for an automotive technology course at my local community college. to my surprise, i now get crazy discounts on snap-on, Mac and Matco tools (up to 50% in some cases).
can only buy one of each item tho.