it all depends on whos doing the job its awrite sayin u get what u pay for but am a painter by trade and done a full respray black for £700 and all it was to do was flatten it and paint it just a freshen up .
when u say ure arches r rusty depends who it is but they might just grind the rust of and fill and paint which is no good as in a couple of months it,l be back thru .
so would need more info to decide if cheap or not
whats the condition of the car ? (rust and dent wise)
what colour is it (is it stayin the same colour) ?
what do u want in a respray ?(do u want inside door checks,under bonnet,boot etc ? )
as if itds just a door shut freshin up respray no dents etc thats bout the asking price ?
but sayin that a painters only as good as his last job so ad want to see previous jobs first . hope that helps mate .