A friend just bought an SUPATX board and paddle package for a very good price after lots of looking around.. (similar size and price to what you're looking for)..
Might be worth checking out.. The 10'6" is better for you and for you to carry.. but the 11'6" would be better for your husband and especially if you want to paddle with your kid on board..
check out the 10'6"x32" ATX here for only $599 (ex demo)..
www.paddlesurfing.com.au/sup-gear/specials/