WHAT THE BEST, AND CHEAPEST CAR INSURANCE TO GET FULL COVERAGE ON??

Insurance rates vary from company to company, so, your best bet would be to obtain a quote from different insurance companies to see who can provide you with the best rate. Only obtaining the rate from one company won’t let you know if you are getting the best rate.
If your vehicle is being financed (you are still paying on it), you would want to have comprehensive and collision coverage. Both of these coverages require that you select a deductible, which is the amount you are required to pay before the insurance company pays. Pick limits that are affordable for you in the event you have an accident (mainly go with the $250 deductible option). Also, pick liability limits that will protect you if you cause an accident, and that will prevent you from being sued in the end. For example, you have limits of 25/50/10 meaning that $25,000 will be paid for bodily injury up to $50,000 and $10,000 will be paid if you damage property. That might be the state limit, but if you hit a Hummer, you are out of luck and the other driver can sue you. Pick your limits wisely.

To compare rates, you can go to the following websites:

http://www.progressive.com
http://www.esurance.com
http://www.insurance.com
http://www.insweb.com