Best amplifier for Martin Logan SEQUEL III

Solid State--THRESHOLD..Tubes CONRAD JOHNSON..Premier Amps.
McCormack is a great match. My DNA-1 dlx did a great job driving the Logans I´ve owned (Sequel II, SL-3, ReQuest) Happy listening! Hasse
I have Sequel II, used to drive them with Perraux 5150B and now I use Sonic Frontier Power 3 and what a different. And I am using Sonic frontier SFL 2 (preamp). Anybody knows the different of Sonic Frontier line 3 to SFL 2 (I am contemplating of upgrading)