Just a couple of comments: First, while “you get what you pay for” is a common claim, it isn’t necessarily true. Paying twice as much won’t get you twice the performance or utility. Second, every machine I know uses keyed dops, but most faceters I know don’t find them particularly useful.
Availability, on the other hand, can be a issue. I would suggest that if you can find a dealer who can supply one, get the Graves and spend the rest of the money on rough. If not, and you don’t want to wait, get something else. Facetron is a good choice, as are Polymetric and Ultratec, and probably others I’m not familiar with.