I've stayed at all four moderates and for your family would go with CSR.
I love POFQ, but their pool is small and rather childish for a 16 y/o. Their pool slide is also really small. We love the jazz music that is playing as you walk up to the food court. We also enjoy Elliot Dyson in the PPFQ lounge. PORS is lovely, but we do not care for their bus service. As much as I love both PO resorts, those rooms could really do with refurbishment. PORS has a really good food court though. We also like Ye Haw Bob's show in the lounge at PORS. Both PO resorts have the boats to DTD which is very convenient.
CBR is my least favorite moderate. I had the worst bus service there and the main pool was always packed. I also did not like their food court. Their rooms have been recently refurbished though and the Caribbean theming is very nice.
CSR would be perfect for you: newly refurbished rooms with queen size beds, the sliding wooden door that seperate the sleeping area from the bath area, biggest hot tub on property, longest pool slide of the moderates, sand volley ball court, nice game room, best bus service of all the WDW resorts, lovely white sand beaches with hammocks, nice food court, health club/spa, and beauty salon for some extra pampering of the birthday girl. Oh we also like how at CSR you can refill your mug right there at the main pool bar and that the pool bar serves food.