hey, fellow southbender!!
we originally booked an 8a cat. assigned cabin due to the same situation of having a family of 4 in one cabin and needing the quad sleeping arrangements. having never cruised before, i was very hesitant to book the guarantee and since you know you need to room for a family of 5, I would stick with your assigned cabin. Our TA was very helpful in leading us toward an assigned cabin, we were also wanting mid-ship so taking the guarantee is quite a gamble for me. Anyhow, 3 weeks prior to our cruise date we were informed by our travel agent that our 8a balcony cabin was upgraded to a cat.11 suite with no additional charge to us. we remain on the same deck however, but we were very pleasantly surprised by the upgrade. I would continue to keep in touch with your TA.