Balanced preamp tube for Magnepan 3.6 or 20.1

Please, an excellent totally balanced preamp for Magnepan 3.6 or 20.1 I can consider? I have two Mcintosh mc501 and one mc402 as amps. Someone told me BAT VK-31SE, VTL and others Audio Research LS-26. I would to obtein an open scene with a clear, detailed sound and a powerful warm bass in general.
I don't know the best combination with Mcintosh solid state amps.
Thanks for your helps,
Andrea
Italy