I just put myself down for a Kit3 (Tenkeyless Blank) and a Kit5 (Mods).
To get the numbers up a bit, I thought I'd share my reasons for buying these add-ons (particularly for the tenkeyless blank):
I think most arrows look odd and I don't really see a reason for them anyway. Even if you're not a touch typist you know, without looking, what those four keys do, so I think this is a case of less is more and I want them blank! And I figure you never know when a blank key is going to make your keyboard look a lot better so I got the Tenkeyless blank just to give myself some room to experiment.
And then Kit5 is a must-have, I think. Why buy a rare set like this and then nail yourself down to one particular keyboard? Buying the mod pack ensures that if, at some point in time, you find THAT keyboard, you can still enjoy your favorite keycaps on THAT keyboard too.