Don,
I do NOT recommend these widebody contracts unless you want to get smoked on, have little to no part in the decision making process and want to beg for a landing. Regarding long term in China, I am a survivor so still here but as I said 6 years ago the medicals are difficult and most guys fail along the way somewhere as I have seen many ExPats come and go. Long duty days, chinese red tape and bureaucracy make the living here difficult at best. If you have other options like a major airline and you are below age 45 stay and pursue that route. If you want to give China a try pm me and I can guide you with my experience here. The money is good but the pain can be excruciating at times.