Which amp would you go with

mesch said it best

If I were in your position, preferred Brit and didn't want to overspend moving "up the ladder", I'd jump on the Creek M2si from Upscale. If there is a better value I am ignorant.
If you have floor space a coupla Dayton SUB-1000s, stategically placed would get your room pretty flat to 30Hz. Either with mucho work or DSP. You are down 6dB @38Hz now. There is a lot of music down there.
Add a pair of Morrow cables and you are hitting your $1000.
Good luck.
I gotta enjoy blooming bliss now. After 45 years of trying I've hit Nirvana with my "~$5000 plus a FPGA" system. You CAN get there from here.

Or you can go way over budget for features you don't need.
Given that every music track has an optimum listening volume level, the M2si will push those Tannoys past it every time.

BTW my 1976 10" cabinet style speakers go 28-30k Hz ±6dB anechoic.
Close to that in my room checked with a Loftech and a UMIK-1.
I paid $240 for them. They have contact paper boxes and every centavo went into the SQ.
They feature tweeters like Wilson used in the first WAMM circa ’82.
They still sound great in my AV system with only one pair of foam surround replacements.

Buy only what you need, spend only what you have to and have fun.