I need help with an amp decision


Equipment: Tannoy xt 8 (91 dB/Watt sensitivity and 400 Watt peak power ), REl s/510, Black ice f360, and an audiobyte black dragon dac. 
Room size:17x21x10h
Music preference, everything but rap and pop, 
question: Can I get some suggestions regarding a solid-state amp choice for this system, please.
I can not use mono amps because of the sub and I really do not want to go the route of a tube amp. 
Two amps I have been thinking about are the benchmark AHb2 or a first watt ?, I will be trying to shop the used market. Any suggestions, would help. thank you

128x128gunmetalzin
Try to find a used parasound hca 3500 or a used parasound a21 amplifier with a good preamplifier like a tanberg 3002a or 3008a.
I think First Watt is a great choice but don’t think they have balanced inputs.  There’s a McCormack DNA-125 on US AudioMart for $929 that’d also be great and can be sent to SMcAudio for further upgrades if desired, but that too has only single-ended inputs.  TMR has a Parasound A21 here, but I think they also have an A21+ for $2399 if you can stretch.  Personally I’d forgo the balanced inputs and go with First Watt or McCormack, but that’s me.  Best of luck. 
@soix

@rocray corrected us, the new-ish j2 is the rare first watt amp with xlr inputs... 25 wpc single ended in 8 ohms, 13 wpc in 4

might be a good match for op’s tannoys

https://www.moon-audio.com/first-watt-j2-power-amplifier.html?gclid=Cj0KCQjw0emHBhC1ARIsAL1QGNenB0E_...