What is a decent sized air compressor tank for painting veicles?

I'm looking to buy a new Air Compressor and Tank so I can paint my truck, tractor, bicycle frames, and other various things that need new paint. I have painted once before, I know how to strip the paint, sand, primer, paint, clearcoat. But I've never used my own equipment before so I don't really know what setup to use. Can I use a 120v compressor? I'm looking for a 100 gallon tank, will that be big enough? Could I get away with something smaller, maybe a 60gal? I currently have a 120v compressor on a 21 gal tank, but the pressure only gets to about 70-80psi, If I swap the compressor to a bigger tank will that be enough pressure or will I need a new compressor. I'd really like to avoid going to 220v so I don't have to run a new wire to my garage. Any suggestions on brand name paint guns and/or other air tools?