Hello Nico_g,
in my recollection, the Tannoys and the JBLs are really easy to drive, thus, some buddies here in Manila drive them with low-powered SETs with finesse.
IMHO, the Krells are the epitome of solidstate amps that are really "SOLID STATE". i am currently using my FPB 200c to drive my Sonus Fabers becaue my SF Power 2 just can't seem to cut it :-(
I think, too, that the FPBs are more desireable than the KAS or the newer EVOs but this is a matter of taste and personal biases.
If you can, please give them a listen in your own venue and then decide.
Best wishes in your quest!
.e.