Attack On Titan is not really related genre wise to Death Note, although you can argue that since it is a bit gritty. It's a good anime though, I would watch it if I were you. If you want more psychological type animes though I'd go with~ Monster Zankyou no Terror Baccanno! Durarara! Mirai Nikki Psycho Pass Darker than Black Higashi No Eden Another Btooom! Steins; gate Ergo Proxy Code Geass Hamatora Most of these give off a similar vibe to Death Note. It'll be very apparent in some and a bit more hidden in others.

Ergo proxy was recommended as well.. I'll look into that 1. Thx! :)

Sorry, one wonderful psychological anime completely skipped my mind. Serial Experiments Lain, seriously one of my favourite animes, and I've watched around a 1000.

Really? Havnt had that recommendation. I'll look it up.

I will say it's not an anime for everyone as it's extremely psychological. It'll make you question reality though, that's for sure.