Fate/Stay Night and Sengoku Rance are fucking brilliant.
Try "Shuffle! Tick! Tack!". Can't say I've given it a proper try, nor that I really know anything about the VN, since I only skimmed through a single route when I was just hoping for a very hot ero scene. (My fetishes require the use of a certain "hidden" hole, which this game seems too vanilia to use. Still very annoyed that Momo doesn't use that place, either. >.<) Gonna replay it at some point from the beginning, 'cause the atmosphere certainly seems to be there. There's a really funny character who hits on every girl he sees. Kinda like what Kazama would be if, instead of adventuring, he chased girls.
And of course, there's also "EROGEļ¼ Sex and Games Make Sexy Games", which is pretty good, if you can ignore the single scat scene that every heroine apparently has.
Merry Christmas, and happy eroge hunting!
Edit: I also quite enjoyed "We Love Master!" and "Koihime Musou"