Preamp for Krell KSA 250 and Thiel 3.6?

Folks,
I have the following -
Krell KSA 250 Amp, Audible Illusions Modulus 3A pre, Thiel 3.6 speakers, Acoustic Zen speaker cables, Pioneer PD-65 CD player, and Signal interconnects. I am looking to change the preamp first JUST BECAUSE it has a separate power supply box with an attached umbilical cord. I am now into using fewer smaller boxes to achieve the same or better sound at the same price. Can anyone recommend a preamp or comment/suggest on the system in general?
if possible.