M visa change to temporary resident permit (wife is Chinese)

I have M type. Last year I married with a Chinese citizen. Mine will expire on April 02. 2015, duration of stay is 90 days. I want apply temporary resident permit but i dont know is possible. And I need take medical examination? What this examination include. I didnt bring any X-ray from my country. Or maybe is better I make 1/3 price one in my country with 1 year valdity? Less problem no need medical examination, 90 or 180 days duration of stay. What you suggest? I leave china almost every year 1-2 times to go my home country, and I have business in HK so every month I "shuttle" 2-3 times between HK and Mainland. I have own HK company, my job no need Z type. With the temporary resident permit I can get chinese ID card also?