I agree with the folks saying that the Pass amp is special and perhaps you should just get help moving it, so you don't have to change it out.
That said, if you must change, I recommend that you consider the Son of Ampzilla II by Spread Spectrum Technologies (SST).
- It only weighs 42 pounds and puts out 220 watts per channel.
- The sound is very Pass-like and exudes the best of aspects of a Class A amp - including running very warm.
- It delivers beautifully on every measure of sound you may have for an amp from bass to imaging to detail without harshness.
I admit that I bought this amp 6 months ago after a careful search and it will be my last amp.
Happy listening however you choose to go!