Rem Varmint/medium Palma or lighter. Running a Proof Research CF "Sendero" right now. I'm with Supercorndogs; lightest weight possible without wonky accuracy problems. Also like enough meat on the muzzle for threads.
Super important for suppressor owners. I had to look around to find a heavy sporter that was .750 at the muzzle for proper shouldering.
Hear, hear! I'm waiting (though not so much patiently) for barrel makers to start offering sporter contours with flared/belled muzzle ends for that very purpose.
I ordered a barrel from Bartlein about 90 days ago. The person I talked to indicated they would make a barrel that way right now.