You might also want to check out the KHS line. They have a Alite 2000 and 3000 that are very reasonable in price, and offer a 15" frame. ( that particular size has a standover height of 28.... not sure where you fall with that) In the model below that, the Alite 1000 they offer a 13" frame with a standover height of 27.3.

Good luck in your search