My bay was welded up ready for painting but still needed a good rub back from the patches of primer and a few dinks that needed filling.  I didnt want a showroom finish but something that looked respectable.  I was quoted £1000 by an accident repair guy, £3000 by a VW restorer, and £2500 by a classic restorer.  I had most confidence in the accident repair guy, maybe he just had the gift of the gab.  Anyway he rubbed it back, called me in, pointed out work I may conseider getting done, ie, a few more dinks, then he set to work doing more prep.  It was painted White upper and red lower.  It took him 3 weeks and the final cost was £1675.  It is a very good job and much better than I was expecting.  The classic restorer said his quote would change inevitably, so he wasnt going to get the job and the V restorer said they would drive it straight into the bay and spray, so for £3k the finish would have been like a 30 year old nissan (datsun!!)  Hope this helps.  best bet will be to go and find some places and see them in action.  I think that is what swung it for me as the guy who did it had a few vehicles in the process of being sprayed at the time and he invited me down to see them before taking on my bay.