Hi Dawgvet,
I have D2 and am waiting on a BM210 S30V. I have no doubts I'll be able to sharpen it (after its NIB sharpness wears off). I can now get my D2 scary sharp.
Either knife that you like the design best WILL BE the best one for you. Design meaning: length, blade shape, handle specs, weight, etc etc. Don;t worry so much about those two steels. As BigJimSlade said, the D2 is not "quite" a "stainless" and that's true, but, I can tell you that with the barest minimal care it will be just fine. He could very well be right about getting the S30V depending on your environment. As I said, I'm still waiting for mine to come in (my first S30V knife).
As far as sharpening goes, I've read this from more than one poster: that once you get used to sharpening a certain steel (i.e. D2), the others become difficult to sharpen until you get used to them. Then, the original one becomes difficult to sharpen. Not impossible, just difficult. I haven;t experienced this yet (and I have blades in about 8 or maybe 9 different steels) but I'm waiting for it to happen.
The one you get is the one you'll like.....AND, it'll be the one that's best for you. Go with the knife design, not necessarily the steel. NOW, if the choice were between say, S30V and, maybe, "surgical stainless steel" (or some such crap), then the steel issue would be more important. This is a general rule I believe in about knives. Good luck.