Aball, You posted while I was typing.
I find your question interesting and your observation about 'matching' right on. I've had a BAT DK5 for some time and I always was less than happy with it, not unhappy mind you, just thinking it wasn't worth all of the loot. I recently picked up a Cary amp, warm in the bass and detailed in the upper mids & highs, but not 'bright' - great midrange. Perfect sounding combo? Not quite, but FWIW does it ever float my boat. Now if I could just get the bass from the Cary a tad tighter! Clearly its all about synergy. :-)