Well for an SR5, I've had an Eden/Nemesis NC-210P combo, a Demeter VTBP-201S + QSC PLX1602 + either a Bergantino HT322 or Schroeder 410R (older model), and lately through an EA iAmp-600 + EA CX-310.
I've also used it through a Demeter HBP-1 + Stewart World 2.1 + Schroeder 410L at a band practice.
The EA system sounds the best to me by far -- solid & punchy, with major clarity.
The Dem HBP-1/Stew 2.1/Schroe 410L next best -- great punch and cut-through.
The Dem 201S/PLX/Berg the next best -- unique vibe, but very musical and powerful.
I'd love to hear one through Genz Benz GBE1200 with my EA CX-310 as well, but haven't yet.
From what I've read from others about these, they outclass the GK stuff tone-wise and with regard to versatility.