Speaker Cables

These AudioQuest ones!! 
https://www.thecableco.com/dragon-zero-with-firebird-bass.html

Check out reviews https://thewirecutter.com/reviews/the-best-speaker-cable/

All you need to focus on is distance and the damping factor of the system. If you are using modern solid state gear, the DF is mostly irrelevant. Unless it’s a long run and super low impedance (1ohm), just get 16awg or lower.

McIntosh mc 1.25 kw

I think I just wet myself. 😂

I remember at a show long ago, listening to a pair of 1.2KWs driving Mac speakers; and while the sound was outstanding - I found those monos uber-sexy.  I told the dealer (forgot who) showing off the system that if I couldn't just leave with the monoblocks, he could just drop them on top of me.

It's probably the larger than life signature blue meter on the front...

Whoops - but back OT: OP’s budget pretty much tosses out any sort of recommendation I might be able to throw his way. My experience in those ethereal levels of cabling is near zero.