I must say it's been tiresome and rewarding at the same time juggling through these 5 amps.
I can imagine!
I'll have to learn more about the JDS C421. I see that it is discontinued now. Hmm. I did find one on amazon.com for $232. More than I would want to pay, but then again, if I just stick around head-fi for another month, I'm sure that I will then be thinking that it's a bargain!