When you reach your goal, spoil yourself rotten!
My rewards are always something I really want!! Try starting a collection of something that you REALLY enjoy, but you can't get the next one until you reach your goal. (This type of goal was great motivation for me.)
DO NOT CRUMBLE AND JUST BUY IT ANYWAY!!
Your goal must be tantalizing enough to inspire you! If you love new Clothes, say you'll get a new pants when you reach your goals... and who knows, they could be a size smaller!
Note: Never, EVER, set FOOD as a goal.