We should have a big thread to help people with this.
My all-time favorites:
Bleach (waiting for dubs)
FMAB (waiting for dubs)
Kekkaishi (waiting for dubs)
D. Gray Man (waiting for dubs)
Ones I really enjoyed:
Right now, I think I'm in the mood for a romantic comedy anime.
I highly prefer dubbed, and I don't want anything more violent than Bleach and FMA, or anything more perverted than Ranma 1/2.
EDIT: Or yaoi or yuri.
EDIT2: My absolute favorite in all media is Action-Comedy, with a pinch of romance. Especially if it's somewhat long.