EC.
I've been there for almost a year (started there originally) and things have been fun constantly. Politicking, religious fervor, bickering, the rediculousness of the Ruler's Channel whenever it gets leaked to the average Nobles, the amount of combat that is constantly happening, and the ever shifting regions are all great draws.
Not to mention my guild in Perdan/Caligus gives me more than a little incentive to keep playing there. Eventually, I'll be Director of the Continent!
Now if only I can get the culture level in Caligus up higher with more RP's!
I've tried Northern Dwi (Xinhai and Astrum) and didn't like it, no particular reason, I just didn't.
So, next on the list, PeL!