I'm not a huge anime fan, I've always been more of a J-Horror fan. In fact before my current GF the only anime I probably watched, and still love, was the Americanized version of Spaceship Yamato, Star Blazers. Nothing will ever get me as excited as that beginning theme song, though I admit its a bit painful to watch now but the childhood memories still remain.
Of the more modern ones that I've gotten exposed to, I have to say my favorites are Black Butler and High School of the Dead. And I have a fondness for Pet Shop of Horrors. I just wish I didn't like all the ones that have like a small release and don't get the huge episodes of the ones I'm not big on. Oh well.