My mini goal rewards so far have been shoes! Three pairs of platform heels, to be exact. I like substantial mini goals, so I tried to space out my rewards so that I could spend more money getting better quality items. Shoes naturally seemed to be the best investment for me because they'll fit when I'm at goal, and heels are so much more tolerable now that I weigh less.
Typically I don't like to spend too much on clothing as rewards because I don't plan to be in it for too long. I did when I was 50 lb down since none of my jeans fit. I'll make another exception for new year's eve since it's the day after my birthday, and I'll use to birthday money on a cute, flattering dress to go out in. Who knows, if I spend a lot on it or really love the dress once I'm to goal, I wouldn't mind spending a few dollars to have it taken it so that I can get more wear out of it.
My goal reward will be a shopping spree! I think I should be at/near goal by the end of March, and I'll be interning over the summer at a law firm, so I'll split my shopping spree between casual and cute everyday clothes and business causal/professional clothes.
If I maintain for a year, I'm planning on getting a boob job

At my skinniest, I was 148 and a small B. So I'm expecting for my boobs, which are still fighting the good fight at a small D right now, to start rapidly disappearing soon. I'm a pear and my booty isn't going anywhere anytime soon, so bigger boobs will help balance my bottom out.