Almost nothing, since Wikipedia says the M20C was made between 1962 and 1978. Not many used experimentals for sale that are that old. A 2013 experimental that would have comparable speed, payload, and range would be 35 to 51 years newer.
A quick browse of M20Cs seems to show current asking prices of ~$45k +/-$10k.
A budget of about twice that (~$90k) puts you into the range of used experimentals less than 10 years old that might satisfy your requirements, as others have already posted. They would all be fixed gear and in theory be cheaper to maintain and fly.
