"$50" paint job.......?

If you are looking for a nice paint job, then don't use a roller. Better off buying a cheap paint sprayer to do a really nice job of it. As far as buffing it out, you would do this if you were just using a paint with about 4 or 5 coats. But if you are going to use a flat base coat with a clear coat finish,then there is no need to buff it out.