The amp I have now, a Dr. Z Prescription head through a 4x10 cab, is fantastic. It has some breakup, but it's still on the clean side. A very inspiring amp. And pretty loud too.
Last year I played an old blackface Twin Reverb at a festival in Lofoten, Northern Norway, it was a loud amp with probably the best Fender clean sound I've heard! Wish I could have brought it home with me.
Haven't been very impressed with other backline Twins I've used though.