Definitely:

Spice and Wolf II - How could I not?
Umineko no Naku Koro ni - Same creators as Higurashi, so there is no doubt.

Probably:

CANAAN - sounds interesting anyway
NEEDLESS - Need a shonen series to hold me off until more Index shows up.
Princess Lover! - Delicious harem anime trash.

Maybe:

Yoku Wakaru Gendai Mahou - sounds like a cross between Index and Kara no Kyoukai (Tohko's part of it anyway). Might be a bad ripoff, might be okay.