Hmm, think you already watch quite a few of the ones I like, in fact watching old episodes of House while I'm typing.
Agree with the Dean factor in Supernatural :)
I avoided Prison Break for ages then ex wanted to watch series 2 so figured I'd given season 1 a go and became absolutely hooked.
Still watch Lost though gets madder by the second, can't help but admire the writers though, how they keep up I have no idea.
I like Heroes though that's getting a bit on the confusing side as well.
Love Dexter (named my late hamster after him) but you're already got that one.
I've always loved ER but it's the last series on now and they're not as good as they used to be.
I used to love Cutting It, more the first 2 series.
Always had a thing about Roswell though back in my Buffy days, find Buffy repeats a bit cheesy now.