I think the first thing to ask yourself with any hone is just how often do you think it will be used?
Unless you intend building up a stack of razors and becoming self sufficient from bevel correction through to final polishing, do you really need the lower stones? If you intend to have someone like Glen hone your razors and just need something to refresh every now and again, then look at the 12k synthetic options - much better in my opinion than the Welsh slates. By the way, the sellers assumed grit ratings for that set are considered by many to be on the high side.