I would vote for either Coronado OR Caribbean Beach, but would lean towards CBR. Here's why:
The Coronado Springs has the BEST pool of any of the moderates. It's huge, beautiful, fun, and has a great slide (not just for kids....just ask my husband!). I can't remember if this resort had an arcade or not. There are a few quiet pools, but they don't offer much privacy. There's a small lake & you can rent small motorboats but I don't really recommend this because the lake is very small & you just end up going in circles. We weren't too thrilled with the food court at this resort.
CBR is a sprawling resort with white sandy beaches, great for kids. Some of the villages have small "jungle gyms" situated right on the beach. Each village has its own quiet pool that is located within the village, but apart from the actual room locations. These "quiet pools" are great for families with younger kids (parents can easily keep an eye on them). The resort also has a great themed pool with a waterfall, and a kiddie pool located right next to it. There's also an arcade, and a stand with CM's that do Caribbean-style braids in little girls hair. CBR is situated on a large lake that is great for boating. Last but not least, this resort has recently been refurbished, and now has a completely new restaurant which I hear is really great.
Whichever resort you choose, I'm sure you'll have a great time!