Do not go cheap on the paint if you are going to do the job. It has to be done right. I had a couple I was working with who wanted to sell their home in 3 month's time so they rushed the repairs and details. They used cheap paint as well. Halfway through the second month, the paint was actually cracking.
The issue with cheaper paint is that it tends to be thinner and more watered down so, from the home sitting without the AC running, the heat dried it out and caused it to fall plum off the wall!