I had the PrimaLuna EVO400 preamp and power amp combo. I wanted SS as well and replaced the PL combo with a Luxman L-509X integrated amp. I like it better than the PL I had, although the PL was very nice. The Gryphon Diablo 120 or 300 is the only other integrated amps I would like to hear in my setup in the future. It sounds like you want to stick with separates, but the integrated amps I mentioned are well respected pieces. The new Luxman M-10X power amp will have more juice than my L-509X integrated amp since more power is your goal.
Upgrading from Primaluna
Recently went down the front end upgrade path and am running a nice table and phono now. I'm curious as to what the weaker link in my system is between my Primaluna Dialogue Premium Preamp and my Dialogue Premium Hp Power Amp. I'm considering swapping out the amp to a Ps Audio BHK250 for the summer to avoid heat, but am curious if I would be better off dealing with the heat and moving up to say an Allnic L-7000/Arc Ref 3 for the Pre. I'm happy with tubes on the front end, but curious if I'm running out of gas with 88DB efficient speakers and a single chassis tube amp. Which amp would you upgrade first and what benefits would you expect?