Still pretty new here, but just as another data point... the rates I was quoted for the 1984 M20J ($100,000 hull value) I am purchasing were pretty nuts: ~$3200 was the lowest (USAIG). Avemco was $3500ish. Others were north of $4000.
Admittedly I don't have a lot of Mooney or even RG time but I am 37 y/o, 600 TT, CFI/CFII, 35 retract, 10 make/model, no accident or claim history.
I sure hope my premium goes down a bit after I get some time in the Mooney.