my old shop charged $30 an hour for paint time, and $60 for body time (we worked on mercedes, ferrari, porsche, etc). lots of variables depending on paint choices (single stage, base/clear, brands, etc) if you do ALOT of the work (ie: taking it apart and putting it together), you should be able to get away with a decently nice job for 2-4K. (this is meaning there is no rust to contend with, and everything gets painted.
i've seen $15,000 paint jobs (ferrari with standox paint) and i've seen nice jobs for $2,000
Do you have the resources to do the job yourself? In all honesty, it is totally within reason to get a almost perfect paint job in a garage. You can pull this off for under 1K for paint and materials. (I just repainted my '73 Porsche 911S in my garage....to show standards (a +$30,000 car, painted in a garage!)
I've got quite a bit of paint experience, so feel free to PM with questions....
Mike