Quincy 390 with a single phase 7.5hp baldor motor, on an 80 gallon upright tank. It's a best that will keep up with anything. Fire it up from 0psi, start blowing the garage out with the hose wide-open, and it will still catch up to the 155psi shut-off, and shut off, while still blowing the garage out.
I got the whole 390/15hp baldor/80 gallon horizontal tank from a college auction, then sold the tank and motor for more than I paid for the whole thing. Added a single phase motor I already have, and an 80 gallon uright tank I got at another auction for $20, and I have one badass setup for next to nothing. Best $50-ish bucks I've ever spent (after buying the electronics, used, to run it).
I used to be happy with the Quincy 330 I had, until I ran the 390. soon, the 330 will be up for sale, as I never use it anymore.