Just completed the system. Will provide feedback soon.
Owing to the amount already spent, the only upgrades in the system could be replacing the nterconnect and speaker cables with Kharma Grand Reference cables and that will be the end. I work for a living and have to stop somewhere.
Lall it sounds like a great system. Are you happy with the end result? I think your words about knowing when to stop are sage advice. I think one needs to set boundaries or rules and then live by those.