What is the best solid state amplifier you have ever heard?

Luxman m900u is my favorite so far and one I hope to get in 6 months. 

second on the M-900u over Dag S250 which i recently owned. tube was Ref 75se. the luxman was superior to the other two imho but would be extremely happy with any of them

Pure SS Musical Fidelity AMS 100
Ayre VX-R Twenty
Vandersteen HPA-5 if you have powered sub or steens

but as Beetlemania said you should consider hybrid like Aesthetix and IF you have powered sub the Vandersteen HPA-7
just 5 parts in signal path, liquid cooling for perfect bias, no emitter resistors, floating ground, built in HRS isolation, the list goes on..... 

Spectral 50th Anniversary, and it's not close. By far the fastest, least distorted, I've heard, driving Alexia 2s, with Spectral's cd player as source, DMC30SV preamp.