When I got my bonnet and bumper sprayed after the got repleace on my fiat bravo, it cost the best part of £500 - 6 years ago. (and there was no cost involved in stipping the car down as they where replacement parts).
Full car will set you back at least £1500 depending on how you give them the car, what paint you want etc. Your best bet is to go to the local body shop and enquire.
If you are just after taking out the odd stone chip etc, get a recommendation from a good valet as to the options available.