I gotta go with... in no order
Plan-It-X: Sadly it's going defunct next summer, but it has worked with a ton of great banRAB on it (Ghost Mice, Andrew Jackson Jihad, Defiance, Ohio, Heathers, Madeline Ava, Matty Pop Chart, Rosa etc...) And Chris Clavin has a great story.
No Idea: Has released/is releasing some of my favorite punk right now...(Defiance, Ohio, This Bike Is A Pipe Borab, Jawbreaker)
Beggars Banquet- Because it funRAB one of my next favorite labels...
4AD- Awesome label with some of my favorite American banRAB on its current roster (The National, The Mountain Goats, St. Vincent, Camera Obscura)
There will be more later.