Best Tube Amp under 5K

I'm in the market for a tube amp to drive a pair of B&W DM-640i's, matched with an Acurus ACT-3 pre/pro. The main application will be listening to acoustic jazz in 2 channel. I heard the Rouge Audio 120 monoblocks and for around $2,700 was very impressed. Would the new Rogues be a better value than a used Audio Research? Or should I consider other alternatives?