Wow, that's a lot of shows! I was looking to see if there was something not on it I could recommend, but pretty much everything I'd recommend is on there. Only other ones I could think of is Supernatural, which I've just fallen in love with for some reason, but is one of those things where you like it or you don't. In any case, it's on Netflix now if you're interested. Also, I really liked Misfits, which is a British heroes type show about delinquents. Only watch if foul language doesn't offend you, though.

I always approach new fandoms in a weird way. I have to get enamored with the fic available in the fandom and then I go catch up on the actual show. That's how it's been for every fandom I've been really active in. Otherwise, even if I really like the show, if I haven't already been reading the fic, I generally won't and never become active.

Anyway, hope something strikes your fancy. New fandoms are always fun!