I had a fiberglass pool and yoou have to remember there is a ledge running along the bottom of the pool around the walls that comes out about a foot and is about 1.5 to 2 feet tall. My advice is to go with the biggest pool you can afford. I went with a figure 8 (free form) and it was way too small! It looked big out of the ground but once it was placed and you add two or three kids and then pool toys the pool becomes very very small. Remember you will have friends over, rafts etc so my feeling is I would rather have too big of a pool that too little.

We're having a San Juan "Star Dust" fiberglass pool installed in a number of weeks. It's roughly 16' x 37'... the same size as your Grand Rodanthe and Grand Buxton. I think it'll be plenty big for our family. However, I wouldn't (personally) go with the Pamlico, as it does seem small. An inground pool is something that you want to have installed once, and you want it to be right.... not have second thoughts while bumping into people while swimming around. Spend the extra $$ if possible for one of the two larger ones.