I agree with Minh in a general way, but I wouldn't be too quick to dismiss the collectable quality of the better Rivendell stock models; after all, look at what happens to RB-1s and XOs.
The absolutely first criterion for Riv bike quality is the handling, and IME, having owned 5 -- tho' not a QB -- they are better in this regard, for my taste at least, than most of the many other bikes I've ridden. I expect that in 10 or 20 years, there'll be a strong market in used Rivs of all types.
That said, I'd ignore provenance, except in a desultory way, and ride the new bike! Hell, I'd ignore paint and cleanliness and ride the damn' bike!