I owned the V70 with a Black Box. It was clean and powerful, but I did find them a bit too pristine, going from Naim I missed the excitement.
Currently using Vitus SS-010 and have been very satisfied with it on all fronts.
Source is dCS Debussy, speakers Living Voice OBX-R2 and Harbeth M30s
Recently put a W4S STP-SE preamp to front the SS-010 and with hugely satisfying results. Added PRaT to the Vitus.