You'd like the Death Note movies, I think. They left out all the boring bits and ended it with Light. No Near, no Mello. Also, they've got good...I don't know, style.

I like shounen better than shoujo, but both will bore me if they continue long enough. In the end, I like seinen best. It's for sightly older audiences and has, in my opinion, a better balance of characters. I think it's supposed to be aimed at boys, but probably has more female readers. Some examples: FMA (Hagaren), Bamboo Blade, Higurashi, Seirei no Moribito, Soul Eater.