Lets see.
Well Rurouni Kenshin is always good. Ronin Warriors, Gundam Wing (one of my favorites), season one of Big O, Record of Lodoss War (both OAV and TV series) is an absolute must see for any D&D fan. Slayers is great as is Ranma 1/2, Hellsing, Outlaw Star, Patlabor, Lupin 3rd, of course Cowboy Bebop, uhm Darkside Blues is kinda strange but still good.