Looking for great mmorpg's

Kh'theuim

If possible post which is the best mmorpg's to ur knowledge. Not something that is pathetically easy, I like a challenge . Something that won't take ages to load like 109hrs then again I do have a fast internet speed so don't worry about that. The ones I have properly given a try are as follow:     
Runescape
Ragnarok
Rubies of Eventide

Please post new ones.