Amp and Preamp for JM Lab Alto Utopias

I know this question has been asked before, but I haven't seen any recent answers. I'm strongly thinking about a change in my amps. I've had the Alto Utopias now for more than six years, and I still love them. I'd like a preamp and amp that pair well with the Altos and that can do well with the great variety of music I have in my collection: rock, jazz, soul, international, electroacoustic, blues, Afrobeat, dub, ambient, trip hop, breakbeat, etc. For the most part, I prefer a lush and warm sound for most acoustic recordings. But I prefer a bit more analytical detail on electroacoustic music, which requires closer attention. I sense a good, powerful solid state amp works best with the Altos for better control of the bass.