There are tonnes of Wu style teachers in Shanghai. As I don't practice Wu style, I am not sure who is the 'big kahuna' in terms of skills, but surely contenders would be:
- Ma's son Ma Hailong, who still teaches at the Wu Jianquan Association on Fuxing Rd
- Liu Jifa (disciple of Pei Zuyin & Ma Yueliang) - noted for dantian skills, although he is getting on in years, not sure if he is still teaching publicly
- Zhou Zhanfang (
http://www.chiflow.com/html/biosZhouZhanFang.htm )
- Fei Guoqing: another notable disciple of Ma Yueliang, some vid footage here: (
http://www.youtube.com/watch?v=i2IA94q3k5c)
As for Wu/Hao style, I would have thought the main go to person for this now that Liu Jishun is in the States is Wang Muyin (can be contacted through Rose Oliver's excellent Double Dragon Alliance
http://www.doubledragonalliance.com/)。Hope that helps.