I routinely hone a razor up to the 8k level and then shave test. If it is up to my personal spec I will go to a finisher or series of finishers for the next shave. If not up to spec then back to the 4/8 or the equivalent until I dial it in. If I didn't have all of the other hones and didn't enjoy playing with them I could be completely satisfied with the edge I get off of an 8k Norton.
So if I wasn't crazy about stones the Norton 4/8 and maybe chrome ox on balsa or diamond spray on felt would be all I would need..... but I sure do like fooling with the finishing stones just for the sport of it.