I don’t think the time you are going is the crowded time of Spring Break. Our school district is at the end of March, and with Easter being in April, I think March 13th shouldn’t be that bad. We did springbreak (the week before Easter) last year for the first time, and have done August a couple of times. Really, I would pick March over August. You just have to be flexible. MK was so packed one day that we passed it up and stayed on the monorail. Eventually made our way to Epcot, where it wasn’t bad at all. During August, it is so hot and humid, I just remember everyone (not just our family, but all visitors) being so crabby, whereas March weather is beautiful.