Definitely Decware. I had Lowther MkII Big Ports and have now switched to Decware HDT's. I use the Decware Signature Mono's. (SV83S) Super amps. Detailed, spacious, dynamic, inner-detail. They are amazing amps. You can actually use the SE84C-S and have exactly what I believe you're looking for.
Lowther Speaker Amp Recommendations
HELLO, I'M LOOKING FOR A LOW POWER TUBE AMP THAT WOULD MATE WELL WITH MY LOWTHER DRIVERS THAT ARE IN THE 2.5 MK11 BASS REFLEX CABINETS. I WOULD HAVE TO BUY THEM SIGHT UNSEEN SINCE THERE ARE NO DEALERS IN MY AREA. FROM READING SOME OF THE THREADS I'M LEANING TOWARDS THE SMALL BERNING HEADPHONE AMP , OR ONE OF THE AMPS FROM DECWARE . ANY HELP APPRECIATED, WOULD LIKE TO KEEP MY BUDGET AROUND 1000.00, THANKS.