I use Badger brushes for all of my painting. I have a 100, 150, and a 175. All three have there place in my work area. The 175 is the workhorse of the three.
I have also used Iwata brushes and they are nice brushes. They atomize water color paint well and the pattern is uniform. When I buy another brush I am really going to consider an Iwata gravity feed.
I also agree with dampeoples, when you need parts you may have trouble finding them. The suggestion about the discount coupons is another good one. Keep an eye on Hobby Lobby and there website. They will offer a 40% off storewide coupon from time to time. They carry Iwata and Badger so you can get a good deal on a good brush.