Best Preamp for a Krell FPB ?


Which pre would be suitalbe, need some suggestions.
Krell FPB 200....Speakers are Eggleston Works - Andra

Rowland
Krell
Audio Research

Some of these maybe? Would appreciate any suggestions.
rapogee
My favorites have been the Singlepower SDS-XLR and VTL 7.5 for tubes. The Singlepower Transparency and Ayre K-1XE for solid state.
The current Krell KAV-280p Preamp. sounds great with the FPB Amplifiers, when connected in balanced mode (neither are CAST). The KCT offers little sonic improvement over the 280p in balanced-mode, with the FPB-200 or -300 Amps., based on what I have heard.