I looked very closely at the 5.3SE myself. I ended up finding a "near mint" one owner Jeff Rowland Model 112. What an amp. beautiful too. I have listened to the 5.3SE several times at a dealers location. Try to use an all copper or copper/silver power cable of 8-10AWG, direct from the wall. I think you will be very happy with it.
Congrats!
Congrats!