I'm going to offer the advice of, spend as much as you can afford on the best materials. The paint will last much longer (and how you store it) in the long run.

I had a car painted 20 years ago. I just got married, money was tight and it cost more than double what I planned. However, it looks as good today as it did then. I credit that for getting the best job I could afford, not just a good deal.

I could have spent much less but may have had to tear the car apart again after 10-15 years. The paint shows no signs of age after all these years. Ask the shops you are looking at what materials they use and do some research before you make a decision.

My $.02.