I'm considering many different minimalist shoes right now. I'm doing mostly fast trackwork right now for the 800, then after this month/month and a half I'm gonna start training for XC. I currently wear Asics GT-2150, quite cushioned. I also had Lunarglide +2's. I'm considering buying Vibram FF Bikilas, NB Minimus Trail, Free 3.0's, Saucony Hattori's, or Saucony Kinvara's. Which shoe would function the best for BOTH Track and XC?