Mine are:

Vice Grip Garage: Very popular for his comical approach to reviving cars. Good, clean, family fun (his wife and kids are helping a lot).
Diesel Creek: Guy revives mostly tractors and such, but just a great presentation and character.
Bad Chad: Mostly a fabricator I want to sometimes scream through the screen to - DO IT THIS WAY! - but he's taught me a thing or two.
Matts Offroad Recovery: Just a fun group helping get people unstuck.
Puddin's Fab Shop: Kind of a goofy guy, but he's growing on me.
Edd China: Of Wheeler Dealers
Mark Roper: Squirrel mazes and other things

There are others, but these are my watch often channels.