Not this debate again! Stop before it gets out of hand!
I use what's cheapest, I've have every brand of spray paint do well and every brand mess up, sometimes it's the paint, sometimes it's me, experiment and use what you like, your process will not be like everyone else's so results will vary.
Like Brett said above, Ollie's sells cheap paint and I too have bought the Duplicolor automotive paint, little cans for .99 cents and bigger cans for $2 (Rocky Mount, NC).
I finally got around to using some of the duplicolor on Saturday, it's a metallic dark gray, I painted the alloy wheels on my car, that stuff is AWESOME! Coated evenly, even when I held a little too close and thought it would definitely run. So smooth, great stuff! Fumes are a little more noxious than Krylons and Rustoleums and store brands, but I was outside, so it's all good. I think for bikes that I really care about from now on I'm using the automotive spray paint.