You should also consider buying the mv50 SuperFlow compressor that many of us use with great results, a quick search will pull up many threads supporting its use.
I had an mv50 for about 2 years. It served its purpose - airing up 32" tires at a time money was tight. It was ok, but slow. Eventually it sucked a reed valve and stopped pumping air. Rather than try to fix a $50 compressor that was never all that great to begin with, I replaced it with a Viair 400p unit for $171 on Amazon (sale price that day, free shipping).
Moral of the story: Buy a good compressor the first time. It will be less expensive in the long run.
ARB is a very good compressor, and takes up less space than comparable units which is an important consideration for permanent installations in today's crowded engine compartments. However, after doing my product research and comparing compressor outputs I am persuaded that Viair is often a better buy. You should check out both product lines and decide what would work best for you. Unless you are certain that you will purchase air lockers in the future, a portable system like the Viair 400p might be a viable alternative for you. It fills my 32" tires from 18 to 35 psi in about 2:20 each (on average). [Even if you do get air lockers down the road, the portable system can be converted to a permanent mount with tank.]
