Our teacher strongly encouraged us to set 2 goals - a 'reasonable time' goal and a 'perfect time' goal. These 2 goals are usually about 5-10 minutes different. He did spend some time pleading with us that if we don't make our goal time that we MUST focus on finding something good from various aspects of the race (start, middle, pace, finish, etc). As you may remember for my recent half, my 'reasonable time' goal was 2:59 and my 'perfect goal time' was 2:56 (based on McMillan calculator) . . . ended up with a 2:53:50 - woot!