Kuroshitsuji- Monochrome no Kiss I like all the openings and endings for this animé too. I just don't like the song they used for the first ending, but it doesn't matter.
Hard question I was between the openings for Deadman Wonderland; Mirai Nikki and Higurashi No Naku Koro Ni...I chose the Higurashi opening because it always gives me chills when I listen to it :p