Which Air Compressor should I buy?

Yeah, but if you try to run any body tools or die grinders, it won't keep up. I know from experience. I don't know your situation, but as a rule for toolboxes, air compressors,and garages, you need to buy the absolute biggest you can, because you will always need more as your ambition and talent grow. You shouldn't need to move the compressor around. That's what air hose is for.