We're thinking of buying resale at maybe BWV or BCV. I'm trying to figure out a good use year for us, but I can't. It's hard to know which time of year we'll always get to travel at. Kids are young now, but they'll be in school before we know it....
Many recommend having a Use Year that would be the month you'd most likely travel or just before the month you'd most likely travel so you'd have the greatest amount of time before reaching your banking deadline, but if you travel more than once a year it may not be so simple

....
Also, only points from the current UY allotment can be banked. So if you had banked points from 2008 UY's allotment and/or borrowed points in from upcoming 2010 UY allotment into your 2009 UY only the 2009 allotment of points would be bankable.
Using school break times as an example :
~ for travel in early summer and perhaps December (holidays break) -
June Use Year could be a good choice
(there isn't July Use Year; or Jan.,May or Nov. )
With June UY you'd have until January 31 to bank your points; ie a trip for December 31 2009 if cancelled by Nov 30 2009 gives you ability to bank points into June 2010 UY. But note that cancellation must be made
31 days or more before check-in date otherwise the points are not bankable and then would need to be utilized by end of UY (May 31 2010).
~ for travel in late summer and either winter break or
Easter/spring break -
August Use Year may be best choice
giving you until Mar 31 to bank and even if you cancelled a trip in April with less than 31 days to your check-in date you would still have a little over 3 months to utilize the points until end of that UY (July 31).