Higurashi's a goodie if you want story and don't mind gore, yeah. just don't watch it before bed.
figure if he considers eva a 7 he probably cares about story somewhat in there. and bebop's main strength is characters, which will get Baccano! quite a heavy bump. though i'd also put down Haruhi since it's got some damn fine characters, though it's an entirely different genre. but hey if he's trying elfen lied might as well try the opposite extreme too if it's just experimentation.
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The King Wang.
Listen up Urinal Cake. I already have something that tells me if I'm too drunk when I pee on it: My friends. - Colbert.