Higurashi had more substance than elfen lied, but only by watching the two first seasons...
Higurashi will also see a continuation pretty soon...
How about shiki??
I'd probably rate it best Horror ever on par with Higurashi, no other anime managed that level of gore before, only higurashi with its torture scenes, elfen lied was just bloody...
Also i droped Gantz, never got really interested in it...
I am a beast forced to feed,
Not on blood I have different needs.
Fear and misery line my plate,
Pain and suffering make it great.
As for the wine to this meal,
There's nothing better than the death I'll deal