Unless you're looking for a very specific color or texture, I think the Depot is a fine place to buy wall paint. Glidden is nice, and we've used Behr too. I've not had any need to use any of the higher cost paint (ie: Ralph Lauren) because these brands have always worked well for us and there are always many colors from which to choose.
I am a huge fan of using paint to change a look. Inexpensive and very quick. (I say quick because my husband does all the painting.) If you don't like it - whoopie doo. Drop another $15 and repaint it.
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