Many of my favorites are from brands like It Cosmetics (their face brushes in particular are amazing, you can find a few at Sephora but they have a full line of brushes that are exclusive for ULTA), NARS (especially their # 45 Smudge Brush, here at Sephora or at NARS), Laura Mercier (
the travel crease brush and pony tail) and Bobbi Brown (her Ultra Fine Eye Liner brush).