A March Use year works perfectly for me. We often travel over Spring Break, which falls in either March or April. We also go frequently in the summer, so we know before the six month banking deadline how many points we actually used. We also have some HH points and typically use them in the summer, so they've been accounted for by the banking deadline as well. If I have points left after August, I can bank them easily, then use them if we decide to go over Fall Break (a long weekend in October for my kids), Thanksgiving or Christmas. If I made plans for Thanksgiving or Christmas and had to cancel them, there's still time for a "quickie" trip in January or February, or I'd know in enough time to use them for a long weekend staying at a Concierge Collection nearby (for me, that would be a long weekend at the Grove Park Inn - a three hour drive away.)
March works perfectly for us!!!!