Welcome to the (anime) club. I haven't personally seen Panty and Stocking but one of my friends brought it up in a conversation at it sounded rather...interesting. Anyway! My suggestions are: This Ugly Yet Beautiful World, Fooly Cooly, Naruto, Bleach, Cowboy Bebop, Baccano!, Air Gear, Kaze No Stigma, Canaan ,Sekirei, Eden of the East, High School of the Dead, Soul Eater, Baka and Test, Kenichi: The Mightiest Disciple, Sgt. Frog, Black Butler, Rosario + Vampire, Clannad, Clannad After Story, Darker Than Black, Demon King Daimao, Shuffle!, Girls Bravo, Trigun, School Rumble, Dance in the Vampire Bund, Mushi-Shi, Chobits, Nabari no Ou, Spice and Wolf, XXXholic, Rin: Daughters of Mnemosyne, Black Blood Brothers, Gun X Sword, Afro Saurai, Onegai My Melody and Happy Happy Clover are just for starters. Edit: Yes, I'm addicted.