I agree with Ben with the fact that if you have only 1 pair of winter tyres then I'd stick them on the back. I rather have a f*ck load of understeer instead of a f*ck load of oversteer. Understeer is FAR safer than oversteer. The weight of the engien at the front is enough to help the front tyres bite into the ice and snow, where as at the rear, on summer tyres, it'll be like watching bambi dance on ice.
PS: Watch videos from major tyre manufacturers about where to put 2 new tyres. They all choose the back for the reasons I said, nevermind what car it is or where the drive goes to.