Which preamp?

Hi, I have a Simaudio Moon w-3 poweramp and use a Moon i-3 integrated amp as a preamp. I want a better preamp that will make my w-3 sing 100%. I have been looking at the new Moon P5.3 and some tube preamps. I have tried a Moon P-5 and it was a little better but I had some noise from the speakers that was not there with the i-3, maybe a mismatch or something was other was wrong.
Any experiences/suggestions?