How about something completely out of the box, like a Response Audio Bella Extreme 3205i integrated amplifer? It's a highly modded Jolida 302 or 502. 50wpc with EL34 tubes, or 60wpc with 6550/KT88 tubes. Should drive the Sonata III nicely, and it's only $1650.
Or, if you prefer a separate preamp, there's the Bella Extreme 3205 stereo amplifier. 50 or 60 watts per channel for $1699.
Or, if you prefer a separate preamp, there's the Bella Extreme 3205 stereo amplifier. 50 or 60 watts per channel for $1699.

