Hello,
Iv'e been blessed to have owned,enjoyed and sold a ton of really good gear over a 30 yr period.
The only Amp I will keep for life though is My Yamamoto A09,which is a 300b set.It took me forever to find one and the upgrades and the initial cost have me thinking I will keep it.I presently use it powering Zu Def 4's in my smaller 2nd system which is a excellent pairing for me.
Lots and lots of really outstanding gear out there nowadays and us audiophiles certainly get the upgrade itch from time to time.
Enjoy the music no matter what you have,
Kenny.