I'm working on fantasy right now, but I will do any story that there is an immense ammount of power behind. In this sense I write whatever I want, and my genre is determined by what I find to be the most faithful way of rendering a powerful story.
Whatever genre, though, I plan to, for future works, embrace whatever genre I go into with my own style and ideas and so forth. Imagination manifests itself in each and every genre, after all. Also, audience differs depending on genre, so that's also a consideration.
And of course genres aren't exclusive. If anything Harry Potter can teach us that, as it's fantasy and mystery at its core, with different genres poking in at different times in different novels.
So yeah- my plan is to never be genre exclusive, but not forcibly so.
EDIT- as far as genres I READ, I enjoy fantasy novels most. However any good, engaging writing is my favorite, so usually fiction and usually fantasy.