Suggestions

Short answer: there is no “best”.

what’s your budget?

Need to know what speakers and/or source?
Do you like warm and tubey?

BUDGET $2500-$3000 SPEAKERS ARE OLD JBL 4320S

These VTA M-125 monoblocks would be a good option:
http://https//www.audiogon.com/listings/lisa6i1j-vta-m-125-mono-tube-power-amplifier-pair-bob-latino-tubes4hifi-m125-29698-tube

Or, if you want to stay with C-J, here’s a nice MV-55:
http://https//www.audiogon.com/listings/lisa6hc0-conrad-johnson-mv-55-tube

although, I would say you already have a great tubey sound with your preamp, so why not save yourself some money and go solid state?
http://https//www.audiogon.com/listings/lisa6gbe-conrad-johnson-mf-2200-solid-state

The horns ask for tubes or class A. 
16 ohms also ask for tubes.
However, you need a lot of power, minimum 60 wpc.  That rules out a lot of tube amps.

From another Audiogon post:

" Compared with and 8 ohm speaker, a 16 ohm speaker requires that the amplifier put out twice the VOLTS for a given power, because it draws half the amps [amperage]. Solid state amps are limited by the volts they can output...within reason (and until a fuse pops) they can hold up this voltage regardless of the current drawn. Thus their wattage rating increases for lower impedance speakers. Tubes have high voltage capability, but can output little current, therefore tubes are usually interfaced using a step-down transformer which trades off voltage for current. This transformer has different taps (connection points) on its secondary winding so as to match different speaker impedances, so that the amp will work equally well with any impedance."

https://forum.audiogon.com/discussions/16-ohm-speakers-pros-cons

Thanks everyone. Ended up with a mcintosh mc275. Happy holidays and stay well.

Nice choice! Enjoy!