Thanks for the post. That is surely comforting to hear.
I used to perform many foolish upgrades in the past only to incur losses when I sold the gear. Although most gear were bought used, few were bought new and sold within a year or two. I still recall getting the Rega Elicit mk2 integrated from the dealer only to sell it after 8 months of use.
I have somehow learnt from past experiences, consolidating the components that appeal to me and selling all other unwanted gear away. Although my current system is fairly new at about 3 years old, it has evolved from the same manufacturer ( Naim NAC202/NAP200 to NAC282/NAP50DR and Harbeth SHL5 to SHL5+). Although I have upgraded the amps, I still retain the 202/200 in the 2nd system and haven't sold any major component to date.
I read that the Krell KAV-400XI is a more refined version of the KAV-300i which is a good thing.
If I happen to get the integrated that I am currently eyeing, it will surely need to stay put for a long time. In other words, it needs to be something quite exotic unlike most mainstream amps I've tried which include the Rega, Plinius, Classe, NVA and LFD to name a few.