Definitely the Trauma Center games and Fragile Dreams. TC was a fun, challenging, and interesting type of series on the Wii that made good use of the wiimote and nunchuck. You can find this game for.... 2-3 dollars used. Def worth picking up. Fragile Dreams was an excellently made horror adventure game. The best part isn't its scary atmosphere, but the characters you meet. Interesting, strange, and endearing characters you encounter in this game. I don't know how much this goes for and I haven't seen it in stores since it was released, so... good luck getting this one.
Oh yea, Calling was a pretty good horror game, although not the lvls of Silent Hill 2 nor the FFrame series.