Rite i'm going to get abuse but i always put the newer tyres on the front as these are the driven wheels and hold the weight of the engine the rears as you know to none of the driving and have little weight of them this is me anyway
Most cars are set up to understeer. In the event of taking a corner a little too fast, or taking evasive action, if understeer occurs, the natural reaction to this will be to lift off the throttle. This in turn could result a snap to lift off oversteer, which the vast majority of average Joe drivers wouldn't be able to deal with and would end up backwards through the sticks.
By fitting better tyres to the rear, they are slightly less prone to breaking away, therefore reducing the possibility of lift off oversteer.
Personally I try to rotate my tyres front to back, so that they all wear out at the same time and I get to buy a set of four all at once. It is slightly harder on the pocket at the time, but ultimately doesn't cost any more.