The value leader in amps is the Rogue Audio Cronus Magnum II or III but they have to have the KT120 tubes and a couple NOS 12AX7/ AU7 tubes. It blew me away many times and sounds better than most amps priced significantly higher.
Pair it with some dynamic refined speakers 90 db or higher and enjoy the clear, refined, highly atmospheric multi dimensional sound stage. A real sonic workhorse.