I spent some time with a Krell 400xi, I was very pleased with it. Not bright or harsh like what I've heard about other Krells. You could buy one, try it and if it doesn't work for you, sell it for pretty much what you paid for it.
AMP Upgrade for Martin Logan Aerius i setup
I remain pleased with my M-Ls (w/ small Hsu Sub), I have a smallish (12 x 14) dedicated 2 channel music room, split time evenly between Jazz/Classical/Ambient with a bit of R&R now and then. CDs/SACDs feed through a Sony SA9000ES, vinyl via VPI Aries/Dynavector setup. Current power is Jolida 1501RC modded to level II (Underwood). Overall I have been pleased with the Jolida, but with the recent Table and SACD upgrades, I am wondering what a $2K solution might bring to the party. I like the simplicity of Integrateds, and have been reading up on Bel Canto, Krell, etc. Any and all opinions welcome. Am I spending enough for a significant upgrade??