I second the good passive (or active/passive) preamp approach! I've sold the Prodigy's (and all Logan's), and must say all tubes is not necessarilly the hot ticket! I like something like the Pass Labs Aleph P or L preamps (passive/active). They are completely passive up to a point, then kick into active. The preamps are extremely detailed and transparent through out! I think given the warmth of tubes and the logan speakers, you'll find this an attractive quality choice! You can find Pass L's for $800 range used, and P's for 1700 plus depending on remote/no remote. The P's have XLR connections, and the L's have RCA only. Good luck