I'm curious what speakers you are driving and also what are your goals for switching the amp?
I own a PA 3100 HV driving Harbeth 40.3 XDs and I'm really happy with the pairing. Warm and musical with what seems like unlimited headroom, however my dealer said the big Luxman amps pair extremely well with the 40's so I am curious.
I would have though the obvious choice would be the A3000? I would assume it has a similar sound to the PA 3100...specs seem almost identical. Plus they would look great together!