Utopias sound is a bit, just a bit on the lean side of neutrality. This make my recommendation of preaamp very easy: JOule-Electra from LA-150Mk2 to LA-450ME depending on your budget - all will creare synergy with your speakers.
With power amplifiers there are more choices. I will suggest you one: If you like cold amp in summer then investigate class D amplifiers: again depending on your budget: from inxpensive but good Wyred4Sound ($2.4k) to Mark Levinson No 53 ($50k).
In my system based on B&W Diamond speakers, I use combination of Joule-Electra LA-300ME (Harry Pearson called it "most romantic" preamp and for good reason) and pair of FULLY balanced Spectron Musician III monoblocks with all upgardes and I am in my own "sonic paradise". Not terribly cheap but yet not ultra expensive - just what my budget allowed.
Good Luck
With power amplifiers there are more choices. I will suggest you one: If you like cold amp in summer then investigate class D amplifiers: again depending on your budget: from inxpensive but good Wyred4Sound ($2.4k) to Mark Levinson No 53 ($50k).
In my system based on B&W Diamond speakers, I use combination of Joule-Electra LA-300ME (Harry Pearson called it "most romantic" preamp and for good reason) and pair of FULLY balanced Spectron Musician III monoblocks with all upgardes and I am in my own "sonic paradise". Not terribly cheap but yet not ultra expensive - just what my budget allowed.
Good Luck