Just thinking.....be careful with 312's on the front and 310's on the rear, you might not get full weight transfer to the front wheels which increase the contact patch of the tyre, the brakes do the braking but the tyres do the stopping!!!! Need to think about that one......
Good excuse for BBK though!!
The 286's are nice for a diet bbk such as NQSBBK with a pad upgrade or grooved discs.
The S3 rears are really required for balancing any of the 350mm+ BBKs such as VWR/AP Racing etc etc