MAC 217 and 187
EcoTools powder brush, incredibly soft and a perfect shape/size for powder and bronzer
Quo angled liner brush
Short-bristled flat smudger brush (similar to MAC 214) that I got in a Costco brush set. Perfect for shadow on the lower lashline, and cheap.
Those are the brushes I use daily and love to death <3 But I guess if I had to choose an absolute favourite, it would be the 217. I am still constantly in awe of how well it blends my eyeshadow, and literally takes all the guesswork out of eye makeup.