I went to Sears about a year ago and bought one of those $20 12V inflators, and it has held up admirably considering its cost. (I live in an apartment so 120V tools are a non-option.) If cost and mobility are a factor, I would just do that. Otherwise, my father has had a 120V Black&Decker compressor since...well, basically the beginning of time. I think he had to replace the hose once after the original rotted away (did I mention this thing is old?) but the important bits still perform flawlessly. I don't know if they still make them the same way, but that's what I would look for in a unit for the garage.