New to Chinese dramas and I must admit that Zhang Vin has my heart at the moment.

Yang Yang, Zhang Han, Wallace Chung, Jerry Yan and George Hu

I've only watched a few Cdramas but Wang Kai definitely has to be one of my favorites. Also Zhang Vin and Mark Chao.

Zhang Ruo Yun, Lau Hawick and Ma Tian Yu.

Baron Chen
Hu Ge
Zhang Bin Bin
William Chan
Wallace Huo
Vanness Wu
Jin Han
Joe Chen
Blue Lan
Hou Ming Hao

top 5 would be
Andy Lau
Zhang Ruo Yun
Liu Ye
Hu Ge
Wallace Huo

but there are many more I like