I had to laugh, the suggestions for comments say to indicate what you might upgrade next. That is easy - all of it! This started out as a 2-channel system and then went through a few changes to get to this point. I would like to move to the platinum series speakers with more power for the rear and center speakers such as the Anthem MCA-50. Also it is time to replace the CD with an Arcam unit (FMJ-33?) but I hate giving up on the CAL 5-disc player. And on & on & on......