CAT or BAT????

I am upgrading my preamp to either the CAT Ultimate SL-1 or the BAT VK50SE. Building new system, and already have: Electrocompaniet EMC-1 mk2, EAD powermaster 2000, (also need new speakers, looking at silverline and soliloquy for the $). My listening room is 18x19.5, and my taste in music is wide open. I want the best midrange "partner" for the EMC, and very dynamic. Suggestions? Thanks! Dave