HELLSING ULTIMATE. It's just so damn good. It's vampires done right. It's filled with unsurpassed narrative quality, beautiful animation, ghastly horror, and unnecessarily brutal violence. Best of all, it sticks to the manga's original plot like glue. It's just so perfect. I like it a lot (in case you couldn't tell by my ava and sig)
I also like Bleach but I'm only three episodes in. I might catch up some day.