Hmmm... I would suggest heavy-drama type.

~ Neon Genesis Evangelion (just don't watch it during study year)
~ FLCL (this one an epic)
~ Paranoid Agent (don't fall asleep k)
~ Noein (require extreme concentration)
~ ErgoProxy (don't miss even 1 episode)
~ Elfen Lied (you not gonna like cute girl anymore)
~ Monster (;")
~ Eureka 7 (if you are gundam+airgear fan)
~ Serial Experiments Lain (use as experiments to watch)
~ Ghost in the Shell - Standalone Complex (somehow i never finish watching it)