At the moment, I think my favorite is Robin Hobb's Farseer and Tawny Man trilogies. I don't care quite as much for the Liveship Traders, which takes place between those two series, but it's still quite good.

I've heard great things about Martin, but there's no way I'm starting another huge fantasy epic until it's finished. One Wheel of Time is quite enough, thank you. (20 years since I started that one!?)