Preamp for Burmester power amp

Hi, nibongese,

A few years ago I played around with your amp (or was it a previous model?) driving a pair of ATC scm50 (not my spkrs)—coincidence, eh!
With the owner, we tried the following pres on loan from shop & friends. Cables were from Nordost. The cd source from Burmester, Ayazi dac (modded; 1st I'd heard of that). We listened to classical, chamber and orchestral music:

• *Burmester 099-- excellent result, music had a sense of urgency/dynamics, low-level detail was OK, hi frequencies OK and pleasant rather than super-detailed, low-frequency extension very good 
• *Burmester something else (cheaper than 099): pronounced midrange, recessed hi & low frequencies, somewhat pronounced mid-bass; not bad result, but pale compared to its big brother.
• *Cat Ultimate (yes that's tubes): similar to 099 but with less pronounced highs; I remember that low frequencies were unusually good, however.
• *Dartzeel "NHB-something": outstanding result. Extension at both ends fantastic, details, no edges, no screeching, good sense of air around the instruments and good dynamics. The amp seemed to have been inspired to boost its dynamics!
• *FM acoustics FM122 single-ended with FM IC: outstanding (- I rarely use superlatives). I remember being so enthusiastic, we switched to a blues & similar (JL Hooker, Clapton, B Guy) just for the sheer joy of it and spent some time drinking and listening and not auditioning!
• *The big Ayre of the moment (XK5?): excellent result overall: no frequency group was pronounced, nice flow to the music ("liquid")-- but lacking in dynamics & extension vs compared to FM & Dart.

(Ultimately, the choice was to trade in the Burmester & buy a used FM pre/power combo... )

Good luck, the fun is in the journey as well as the destination!