i picked up a 780 for $10 at a garage sale and was shocked at how good it sounded--it was significantly better than most of the vintage hk, yamaha and marantz i've cycled thru. since it was sitting unused i ended up passing it along to a buddy (a move i've regretted), who uses it for vinyl is similarly rhapsodic. now, you're heresys are easy to drive and i wouldn't be surprised if they paired with with the 780--keep us posted.