"I'd recommend looking into a Decware amp. Gopher on this forum loved the Taboo with Zu Souls and I think that the lower powered Decwares could work well too. "
I actually owned the Torii MK3 with the Soul Superflys and I can attest to it having been a good combination, but not until I had a very good active preamplifier in front of it (Audion Premiere) which puts it above OP's stated budget.
What I DO recommend and know is awesome with Zu Soul Superflys is the Melody MK88 integrated. Its retail is just shy of $2000 and I preferred it to the Torii/Audion and the Rogue Cro-Mag. Drop some Black Treasure power tubes in, some JAN 6SJ7s and GE five star 6ak5 tubes in there and you've got an amazing kit.
I actually owned the Torii MK3 with the Soul Superflys and I can attest to it having been a good combination, but not until I had a very good active preamplifier in front of it (Audion Premiere) which puts it above OP's stated budget.
What I DO recommend and know is awesome with Zu Soul Superflys is the Melody MK88 integrated. Its retail is just shy of $2000 and I preferred it to the Torii/Audion and the Rogue Cro-Mag. Drop some Black Treasure power tubes in, some JAN 6SJ7s and GE five star 6ak5 tubes in there and you've got an amazing kit.