A good one is EXPENSIVE and it won't pump up your tyres, paint your car, blow out dust etc etc, just make sure you get a decent hose as those springy orange things aren't big enough diameter to run a gun properly.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.

If yu want a cheapy, I have one that has hardly been used. One of the Kmart ones from memory. $70 and you can have it. Only time I used it was to blow up a bunch of baloons for a party. Not much good for use on sanders, rattle guns or big painting jobs.

Pimpreza - Yeah, I'm starting to realise that even though the electric rattle gun would be hell convenient and useful, the good ones are more than I'd planned to spend on the compressor and it can't do all the stuff you mentioned!

GX-REX - Cheers but I think I might need something a little better spec'd than that! hehe.