Mabinogi is my fix right now. I stopped playing Maple when my friends did, the grind was annoying and you're prone to drama.
If you're looking for something different, then a couple I can recommend would be either Mabinogi (another Nexon game) or Perfect World (Aqua and I were addicted to this for a while, I currently don't play).
If you decide on Mabi, I play on the Tarlach server under the username Altera.