Anime series that keep you hooked

I have a question to all hardcore anime watchers here.
I've watched about 5-7 full anime series ever because everytime I start watching one I get bored after 1 or 2 eps. Latest one I watched was Ichigo Mashimaro and I only watched half of it because I couldn't find subs for episode 7-12. I found it to be pretty entertaining and "easy" to watch. Other series I've watched are Hellsing, GTO, Azumanga Daioh and R.O.D , all of them were decent atleast and kept me hooked enough to watch them. So hit me with your recommendations of anime series that won't bore me to hell and make me stop watching after the first episode.

Im happy to see Escaflowne being mentioned. It was such an underrated series to a point. The one thing that had me hooked with Escaflowne is the richness of the series. The music as well just rocked. Its one of those series that both girls and boys would love.

Too bad FOX has to be butcher the damn thing when it made its American debut.