For a confusing and indepth plot and concidering you havn't already seen it and appear to like all the main stream stuff, try good old Neon Genisis Evangelon.
Personally I think it's one that everyone should watch atleast once. :)
dying notice Tsubasa Chronicles Honey and Clover Azumanga Daioh! Blood+ Strawberry Marshmellow Buso Renkin extreme college females (slightly perverted, yet particularly humorous) Welcome to the NHK Pani Poni sprint! Rozen Maiden Soul Eater xxxHolic
I LOVE THESE SORT OF QUESTIONS ^_^
Ok so, Bleach, highly recommend cus it has a great plot, and it just keeps building (there are very few if any fillers, and you just admire it the more you go along).
DragonBall, DragonBallZ (classics, basic super power given to a seemingly inconspicuous person who turns out to be _______ =x)
Black Cat (good action movie, plot sometimes has a little to be desired at parts, but overall it is just beautiful lol, not to mention a fair amount of comedy to keep it interesting)
Rurouni Kenshin (again, a classic. I prefer the manga to the anime myself, but the first i think 50 episodes pretty much follow the manga and are really good ^_^)
Lastly, Naruto (it was on Toonami, Adult Swim, and you see those retards (no offense to anyone) with the metal bands on their foreheads attached to cloth with a leaf on it. Yes that all came from this ninja and secret techniques series. Teenage kids with awesome powers like shadow manipulation, fire jutsus, and the creation of doppelgangers. A must see for any anime fan (at least once)).
These are like the BASICS for anime, gotta see em some point.
I'll list a few others though that are just random, but you should look at to see if they interest you:
Lucky Star, Tenchi Muyo / Universe / Tokyo (3 seasons), Outlaw Star, Negima, Slayers, Gundam Wing, Mar, Moonphase, Kodocha, Tengen Gurren Laggan, D. Gray Man (GOOD! i'd add to top but too lazy), Hunter X Hunter, Dears, Hellsing, .Hack, Pokemon (lol), and so on ^_^