Looking to downsize and for suggestions for amp(s)

Going used Audio Research is a great value proposition. I switched to Audio Research SS D240 MKII. There are many models around this design. Its fully balanced dual mono configuration offers highly musical (full range) transparent and powerful audio. Until recently, I was driving PMC MB2SE and they sound great from bass mids to highs. Like a few others have said here going Audio Research, and I’ve come from Pass XA25, Esoteric F05, Line Magnetic 518ia, and Krell, AR is the best overall sound I’ve heard in my systems.

I don't know about the Hawks but I once had Obelisks which sounded terrible with my 300wpc expensive power amp. I later heard them with a smaller McCormack amp and they were so good I regretted selling mine. The guy demonstrating indicated that the Shahinians were particularly sensitive to different amps and didn't work well with all. So if the Hawks are the same be careful which amp you eventually buy.

Jeff Rowland 125! Or 555!

You have really nice amps that provide the power you need for your 87dB speakers, and that you like the sound of. Is it really necessary to change? They are not Class A so there shouldn’t be too much heat and it seems they would do fine in an open air type rack. Unless you are moving to Class D, I doubt you are going to make a meaningful sonic improvement or even a lateral move with a smaller sized amplifier. I don’t see your system so it is harder to comment but you could try a different rack, downsize the number of boxes in your front end (i.e., if digital, look at Grimm MU2 or similar) and keep the amps. Unless you plan to quit listening, why give up something you really like.

Don't laugh but I heard two Fosi mono amps powering Spatial speakers and it was pretty amazing. I know the OP wants to spend more than that but holy moly, it really competed with the Orchard amp right next to it. (We A/B'd the two.)