You may be able to get whichever UY you would like. FEB 2009 is the first UY available. I just told my guide I wanted a JUN UY, and they fixed me right up.
I am considering buying 160 pts at BLT and doing a 150 resale at BCV and would like them to have the same UY so it will be easier to manage. December is the best UY for me based on my travel times, but almost anything will do.