Hmm, if you don't pay for your LSDAS report until you get your second score, the school should not get it and thus your file will not be complete and they should not evaluate your application based on the first score.
I would still advise you to wait for your score before you submit your applications. First, you will have a better idea where to apply (might save a couple of bucks), and second, you might get some fee waivers if that score is good, and that never hurts either! You can still have the application and all essays ready, and then send them out on the day you get your score.