I am going to say something that may cause me to look like jerk, but please understand, I don't mean it that way.
Whenever I paint something I use really good paint, I don't even consider "budget paint". The way I look at painting, and most things for that matter, is that I would rather spend $100 to get something done and have it look really good rather than spend $50 and have it look bad. If I get the job done and it looks bad then I tend to do it over again, the right way, and I end up spending more money on the project than I would have spent if I had just done it right the first time.
Anyway, right or wrong, my thinking on the subject is to forget about cost and just do the job right the first time. It will look really nice, you will be glad you did it, and you will most likely save money in the long term. That is my thinking for what it is worth.