I'd say the 1712... Skipping MultEQ XT is, in my opinion, insane. How can anyone prioritize network gimmicks over it, especially when most likely anyone who would use such a feature already has other gear that has network connectivity and can do the same stuff (aside, I suppose, from firmware updates for the receiver...)?
OP, check out the Denon xx12 thread to compare features between the models, particularly the 1612 and 1712. You may or may not agree with my opinion that MultEQ XT for sound quality is more important than network features.
"Vintage" is good for wine, not for A/V equipment.