^ Ummm, I'm not sure who would be the most popular. So Hee is definitely popular. But I don't know if it's really in the positive way. One of the favorites is definitely Yoo Bin who everybody seems to love. But too be honest, I really don't know.
As for recommendations, I highly suggest downloading their 1st album. It's wonderful. "Ee Pabo" is my favorite track. <3 Their "So Hot" single is also great. "This Time" is <3. They are both in my download thread.
Check my sig!