You get what you pay for, remember that. If you pay for a $500 paintjob, you will get a $500 paintjob. If you pay for a $4000 paintjob, you will get a paintjob that looks like it's worth $4000.

There really is a difference.

If you insist on going with a budget paintjob, make sure you do the sanding and prepwork yourself; I've heard far too many horror stories about places like Maaco doing terrible sanding and prepwork and causing the car to come out looking terrible.