Diane is the standard. I swear by them joints. They wear decent over time. As for another decent brush, I picked up a brush called Scalp Master. It was a double sided edition that was decent.
As a suggestion, you might want to buy two brushes at a time of you can afford it. It’s nothing worse than wanting a specific brush model and it being sold out. Brushes seem to wear out at the worst time when the beauty supply store is closed. Having that extra brush on reserve is a boost.