I've seen that one episode of Ore wa Kanojo o Shinjiteru more times than I can remember.
I tend to read 'em more than watch though, and my favorites right now are Napata's Lovely Lover's Love and Another World by Yuzuki N Dash. Love the artwork for both, and the stories aren't that bad for hentai. Lots of "d'awwwww~" moments in Napata's stuff, and despite Another World being NTR based, the guy doing it isn't a completely unlikable ass.
Take Me On is my crowning favorite, a vanilla based story line that isn't afraid to go further. Don't know if that's the hentai's real name but again my favorite. Also really like Cherry Break if I remember it right.