Not that I want to be the only dissenting voice here, but I wouldn't buy a 204 Sharpmaker until they start putting out coarse grit sharpening sleeves or rods. The sharpening media that they have on there just doesn't take off enough metal fast enough. Since most Benchmades seem to be sharpened fairly high angled, you'd better have a lot of patience using the 20-degrees or 15-degrees on each side setting.
Not many people have thought about this before, but the Lansky system will do a pretty nice job on lightly recurved blades with just the standard hones (you don't need the V-shaped hone). In fact, I even managed to turn a BM 730 into a recurve on the Lansky (using an extra coarse stone and a bit of patience), which one of my friends thought was pretty cool. It might round the corners on your sharpening stones a little bit, but it's really no big deal.