You want a stiffer rear to get the back to rotate easier. Personally it's a bit rough for PA roads, but bareable. I think next time I will go with soft in the rear, and dial up the shocks to be stiffer and maybe go with 205/50x15" fronts and 195/55x15" rears.

If you are going to use this for everyday driving and maybe some autocrosses I would go with 400f/350r. Get the same length springs, same diameter and that way you can switch the fronts to the rears and vice versa later.