If you're planning on using an external DAC, I'd put the C-22 Commemorative Edition circa 1995 on my radar for consideration. It would be a sweet match for the Mc-60 amps. I've never owned one and it might pre-date the inclusion of XLRs if that is a consideration. But it would look great and I'd bet it performs like a champ!
http://www.roger-russell.com/preamps.htm