Congrats on gettting the FE back up.

I think having studs just on the front tires can be a safety issue. Similar to having different brands of tires front and back. It changes the handling characteristics of your car.

Imagine taking a long sweeping turn at 55mph. You hit some ice. As your rear tires have less traction your end could slide out -- oversteer.

I'd go no studs all around personally.

http://greenhybrid.com/compare/mileage/car/3686.html

http://greenhybrid.com/compare/mileage/car/4955.html