There is too much variation between cars, drivers, policies, records, states and companies to make submitted answers in any way helpful to you.
E.g., I take out million dollar liability policies but self-insure at-fault damage for two middle-aged drivers in Colorado with clean records. My current 2012 Prius (v)agon costs $250 a year and our 2013 Honda Fit costs $150 a year. The M3 will be ~ $300 a year for us, as I understand underwriting.
Other people will pay 10x that amount. Your better approach is to call your own insurance company and ask what the premium would be if you bought a $40k, entry level luxury car that weights about 4000 lbs. Pick out a model ahead of time and ask yourself if you would keep the same policy limits and deductions.Then expect to call around for quotes when the time comes; and in the meantime avoid speeding violations and at-fault accidents*.
How does one reduce the chance of an accident ?
- Learn defensive driving
- If you are an aggressive driver, change
- If you have any stupid behaviors while driving (texting, chatting on the phone, intoxication etc), stop.