Looking for a good shounen-ai anime!

I'm looking for an anime in the vein of either Gravitation and Loveless, where the mxm relationship is obvious, or something like No. 6 where it is heavily hinted at but never definitely stated. I like basically any genre of anime, from action to humor to pure romance, so I'm open to all suggestions.

Right now I'm giving Monochrome Factor a shot, but always looking for suggestions.