i tried blush & foundation brushes from sephora as well as few eye shadow brushes.
they were OK. founation & blush were about $16 each? i know Trish Mcevoy brushes
are good, shisheido and shu eumura also, but more expensive (Trish is like $30 and shu in the same range)
i'm not a fan of using brushes for anything except blush/bronzer, because i'm too lazy to clean
them also, i like sephora's because they're small.
I'm going to second the MAC recommendation. I've tried many many brushes, but have found MAC to be the best. It helps of course that I get an employee discount, but I wouldnt use them if I didnt like them!!