To going rate now for a public middle school teacher is 5500-6000 Yuan, depending on where you want to go. These are low hours, low stress positions. However, you kind of have to play a psychological mind game with the students if you want to really teach them something.

Bigger cities like Nanjing are on the low end because they are highly sought after. However, they offer more opportunities for side jobs that can double, and in the case of my friend, triple your salary for side work and tutoring.

Country schools, like where I am at, offer a higher base salary and there are opportunities for side jobs- if the school is not banal about you working outside of school you can increase your salary from 50 to 60%. Moreover, the cost of living is low.

Also, the closer the city is to Shanghai the more they seem to pay. Nantong averages about 7,000 and Suzhou about 9,000.
I once asked a Chinese friend of mine if he had to choose between 7.5 K in a small Chinese town where I am now, or 9 k in Suzhou where I was offered a job, he recommended to stay in a small town: so I did.

I wish you luck.