I really like my mathews, but if you think your going to grow some more, i wouldnt get one. I know on my legacy the cam is stationary, not sure on the mustang. The alpine micro is a good bow, but i always had problems with the limbs. We pressed two down at the store, and they both broke in the same spot! This was with caution taken also, so it wasnt carelessness. PSE makes some good bows also. Bowtechs are also right up there with mathews. Hoyt makes a couple packaget bows that are really good, and there not to expensive.
If it was me, id get the Mustang, but thats cause im a pretty die hard mathews fan. It hasnt let me down yet.