I now have all (Single Coil, P90 and Humbucker).
Some Single Coils just don't cut through, so a Blade can be more practical; however, if you split a Humbucker then I think you cover this ground. As mentioned above, the Seymour Duncan '59 and JB split very well, as does the Jazz.
It's more important to have a Bolt-On and Set Neck Guitar in my opinion, as there's now nothing I can't do (my Yamaha SG does Jazz, but it's normally this Genre that you miss out).