I tried many including Vitus RI-100, Plinius 9200, plinius Hiato, Jeff Rowland continuum 500, Accuphase E-470 and E-600, Luxman 590ax, Bryston 135, Musical Fidelity Nuvistas, BAT-3000 and some others during last 15 years.
Currently have PASS INT-250 and INT-60 before. Both are outstanding and for the money (buying from Mark at Reno HiFI) and reputation and service, I doubt you can find any better than this.
Pass INT-60 would be my choice - it will get you closer to life sound than any others I heard. It has 2K VA toroidal transformer inside, even so it rated only 60db at 8ohm and 120 at 4ohm, it highly biased to class A and drove my speakers (Sonus Faber Guarneri Evo that are not that efficient) without braking a sweat.