I've only used one so I'm not the definitive source, but . . . A Paasche VL (dual-action). But it's been a worhorse for me over the last 7 years. For me the dual-action took some getting used to but now it's completely intuitive - and now I'm incredibly glad I didn't get a single action brush.
I started with a cheap Sears compressor, but it was borrowed, and it didn't work very well - not enough pressure. I bought a small compressor from my hobby store and I hated it too (also not enough pressure), now I just use my big 5 gal., 3.5 hp compressor in my garage (regulated ofcourse) and it works really well, although sometimes I don't feel like going out in the cold, or making that much noise.
Whatever you get, practice on paper, t-shirts, whatever until you get the feel for it. Also, make sure you carefullly clean and maintain your brush.