Probably get to compare mono 2102s to my current set up sometime in June. As I said before, I'll also listen to the 501s, but I'm a dyed in the wool tube guy so I think I know which I will prefer. As for used Indra which is only made as an IC (and which I bought used on Agon), the biggest impact will be between cd source and pre. With Meridian's phenomenal transparency, you'll really hear a difference, esp in liquidity and soundstage and the upper treble. I must say that the difference was significant when I had the Mac 2200 pre but even more so when I replaced the 2200 with the C1000. The more transparent the system, the more significant the impact of the Indra. Incidentally, I'm surprised you didn't like the Hydra. Did you get a good pc (esp Shunyata) to plug it into an outlet? That is fairly critical to success
imho. I'll let you know what my conclusions are on the amps. Thanks for the advice and happy listening.