Hmmm... How about Code geass? (I havent really finished watching... its really complicated and Im still figuring out what's going on... Its about a genius boy fighting a war using psychology)
Or perhaps gundam seed... Lots of machines and fighting...
Hmmm but for me, I love the psychology kind of genre, so probably Liar game. Best for me.
Kindaichi Shonen no jikembo, Death Note.
The rest are not really anime... but...
Hidari-me Tantei Eye, Furuhata NinzaburÅ, Tantei Galileo, Bloody Monday.
This is not really detective but...
Liar Game. (Psychological) Requires thinking too and battles using logic.
Code Geass (Haven't really finished watching)
Its an anime about incest. And blood thirsting vampires, preying on unsuspecting humans.
Joking,,, Its a story about how vampires and humans coexist within a school. The main human female character was saved by a vampire and she thinks she is in love with him. Theres another guy character who is a vampire slayer whose parents got killed by vampires. He's now living under the same roof as that girl who is in love with a vampire. There are possibilities that this guy loves the girl as well.
Its basically a romance show and some blood scenes and some scenes which might arouse you. Not for minors I guess :P But who cares~ I've watched worse and even 9 year olds are watching...
Went to the doctors, Eat great food, go back home, took a nap, back onto DCW, chatted for a while, something unhappy happened, felt worried, felt better, continued posting... I guess will be going to bed soon...