Brushes are an investment. I've had mine FOREVER (some 10 years) because I take such good care of them. Cleanse regularly with a bush cleanser or baby shampoo and always dry them laying flat. The bristles are glued into the base so you don't water draining into that.
I have a ton of great brushes but this list of eight is all I ever use. It honestly makes a huge difference in how makeup looks on the skin. And when used correctly, these brushes can save product and minimize wasted makeup.
1. Shu Uemura // angled blush // 20H
2. Bobbi Brown // concealer
3. Nars // kabuki
4. Stila // flat shadow liner //#13
5. MAC // brush cleanser
6. MAC // crease blending // #224
7. MAC // shadow // #242
8. MAC // foundation // #187