I might should mention I'm currently using a NAD C510 (same internals as the M51). No real complaints. My experience at shops & shows is that the best systems are almost always shown with vinyl, and more 'entry-level' systems with digital. That said, from what I have heard, I don't necessarily think there's anything 'wrong' with Delta-Sigma like some do, just that R2R has sounded more natural.
However they've previously all been out of my budget (Lampizator, MSB). Now it seems that all of a sudden there's a plethora of affordable choices (see also Metrum & Soekris).
Thanks for all the replies.
K