Best Integrated Amp You Ever Heard?

I am tired of the Pre-amp+Power-amp game. So, I am in the quest of finding a really really good integrated amp, preferably used, so I can save some money off the original price.
Right now, I have a pair of Triangle Celius (92db), but I would like the amp to be able to drive other not-so-sensitive speakers.

What is the best integrated amp you've ever listened to?

Thanks,

Josep