I missed answering the question on pre-amps....
Legacy Focus 20/20: Edge Amps G8 with Classe CP-700 2-box pre-amp
Legacy Focus SE: Classe CP-700 2-box pre-amp, later upgraded to Esoteric C-03
Legacy AERIS with Xilica and later Wavelet: Esoteric C-03, later upgraded to Esoteric C-02 about 3.5 years ago; what an AMAZING pre-amp, does not get nearly enough mention!
My new Caliber XD "custom" plus dual Foundation subs inbound: will utilize my Esoteric C-02 pre-amp
McIntosh amps: I don't have enough direct experience to recommend specific models beyond having heard a large array of the latest 1.2KW and 2KW models at a friend's place who frankly has no budget limits, but others here can help you out.
I've found the Esoteric A-02, AVM 8.2, Emotiva XPA-1 monos, and various tube amps from other companies to be more musical (to my ears,...remember it's just an opinion) and more to my taste.
Questions or want to jump on the phone on this or any other audio topic,...PM me.