I've seen Game Rai Game Rak and Sawan Biang.
Depending on your personal taste:
-GRGR has a great main couple, pretty people to look (yaya and nadech) and a well fleshed story.
-Sawan biang has an older feel to it (because of the way the characters act and think) and there are a few rapes in it. But to me Anne and Ken are reason enough to sit through it all.
I liked Sawan Biang better but would recommend GrGR more easily.