Chime in time:
A note about needle sizes. They generally come in 3 sizes, Fine (.2mm), Medium(.3mm), and Large(.5mm). Start with the medium.
The first brush I ordered was this Master Brush G233 from Amazon: $40
I've been happy with it. It's a knockoff but works just fine.
I then ordered a Badger Sotar 2020 with a fine needle. The fine is just too small for acrylics, I have constant clogging issues. I also lost the spray tip and it was $30 to replace. It's build quality is much better than the Master, but too be honest I'd go with a cheaper brush to start with and use the extra money to get your incidentals, like thinner, cleaner, needle lube, etc.
I just ordered this Master G34 with a Medium Needle: $30
The cup is smaller than the G233 and hopefully easier to clean.
If I was making a living with my airbrush I'd absolutley go with a Badger, but these cheap Masters seem to be OK.