Cheaper the better but want a quality one also.
^^Don't find that to often:snorkel:^^
I like the speed of Kilby OBA, but it's pricey, and you have to mount the compressor under the hood (belt driven from the engine)
VIAR has a nice set up, that will fit in the back of a TJ. Add a tank somewhere (underneath, behind the seat, etc) and you can run most air tools.
Just need it for airing up tires?
I use a small 2 gallon, 110V compressor, run off my 400W inverter.
Works great for airing up, blowing dust out of filters, radios, etc. And also works great for air mattress' and pool toys!
Plus, you can run power tools off the inverter:elkgrin:
I picked up the compressor for $40 on sale, and had the inverter already, so I got away pretty cheap.