Preamp Suggestions for my system

I'm looking for suggestions on which preamps to consider for my system combination. My system consists of Manley 300b Neoclassic PP/SET monoblocks driving the new Omega Super 8XRS (96db efficient) single driver alnico speakers. Cabling is Acoustic Zen Silver/Matrix and Hologram II for the speaker cables. I'm currently using a Manley Shrimp but I am looking to upgrade to a reference level preamp as I am looking for further resolution and detail, bigger soundstage and better/deeper bass control. I want a musical but not overly analytical sound with neutral voicing.

The Omega single driver are very revealing of whatever is upstream and I plan to hang on to the amps indefinitely so really looking for a preamp that will mate well with my amps. If I decide to go to different speakers in the future I figure I would at least like to have a rock solid front end to build off of (especially if I decide to go to even higher sensitivity horns down the road).

I have been looking at possibly a Conrad Johnson CT5 or something at that level. Would this be a good choice and are there other preamps I should audition at that level ($3-5k used or new).