Preamp suggestions

Just a clear up here. Your speakers are the Snell E series 2, not Klipsch Cornwalls, as mistaken by George ( which is surprising, as George is rarely wrong on these pages ). Easily, a 9 db difference in efficiency, so passive is a bit more questionable, depending on the voltage output of the source ( s ).

I prefer not having a built in dac in a preamp / integrated amp, as dacs are ever so changing, and as much of an excellent design it could be, digital circuits, ime, can effect, badly, analog circuits. Down to the shared power supplies and power cords, keep them separate.