£1k is about right, I had a votex splitter, R32 skirts and R32 rear done for mine and I didn't have much left, especially as I couldn't get a 5 door near side skirt so had to pay vw £283 for one...
As said if a decent body shop does it you should be fine for years but there's always gonna be a slightly higher chance of flaking. As MC said the pre painted body parts are good, alot of people have done the rear bumpers through the company above and had no problems.