Musical Fidelity KW Mono's or Chord SPM 1400E's

I've got a tough decision to make. Stay with my Musical Fidelity KW Monoblocks which I have connected single ended to a Chord Electronics CPA 5000 Preamp or spring for a pair of Chord SPM 1400E monoblocks that I can connect balanced? I've always heard to get the most out of the Chord Preamp I should run it with Chord amps.

Thoughts?