The RE-11A is an even better version of the RE-11. http://www.s2ki.com/s2000/topic/9835...t__p__22489507
If anything you will have sightly more grip in the front with the RE-11A. The reason the RE-11 is more expensive is due to Bridgestone adjusting their prices to better compete with other manufacturers in this category. The RE-11A has all the benefits of the RE-11, with an increase in overall grip at a cheaper price.