....Like they say in Detroit, if it ain't happenin in the D it ain't happenin. (I assume thats what they say??) I have a model D with the early oscillators and it is pure bliss. If you need more functionality for recording, and you are willing to sacrifice sound quality for functionality, you could buy a voyager but you might as well just switch to using crappy software synths. The voyager has its own sound that I know a lot of people like but if you are debating a D vs a voyager you are doing it because you like the minimoog. You like the fattness, the extreme creaminess, etc. You will be sacrificing some of that for features. In the end you will kind of have a minimoog. I don't think that is what you would want. Although you may be happy with a voyager, you will always have a more beautiful sound waiting for you with a D. If you are looking for the sound that is minimoog, you will get it with a D. I feel that a voyager is more of a cross between a D and every other analog/analog wanna be synth out there on the market as new right now. One crazy guy on youtube said it well while comparing the d and voyager. D=fat voyager=juicy. Everything out right now is Juicy. My prophet 08 is a juicy version of a prophet 5. Its what todays synths are.
The voyager does sound nice though. It sounds more like a Moog Prodigy or any other newer moog than a D. Really, in a perfect world I just wish the micromoog had two more oscillators. That thing sounds the best. But until Bob makes one like that, I can only dream of having my megamoog back (see my vid)
Another quick thing about the D. It has a presence. The look of the synth and its presence that it has is directly representative of its sound. If I never saw a minimoog D but heard one, I would probably still envision an instrument that looks pretty close to a minimoog D. While the voyager to me looks like a wanna be minimoog D. Yes, you could say its a minimoog D updated for the times, just as its sound is....but its all still somewhat of a copycat and not completely original.
Buy a D. Try to get one with a low serial number that hasn't had its oscillators replaced. While you're at it, buy me another one too! This has been another installment of the truth (my awesome opinion), from Mr Kondel

******Jim, I hope you haven't thrown your CS-50 off a cliff yet. I thank the lord everyday that mine starts up and still works correctly****