How about something like the San Juan Pools' "Crystal Cove"? (Link below) It's roughly 12' x 18', and looks like it has the type of sun deck that you're looking for... not too big but not too small. We have the San Juan "Stardust" in our backyard. Hope this helps a little!

Here is a link that might be useful: San Juan Fiberglass Pool - Crystal Cove Model

...and this link is a better picture of the sun shelf looking down into one of that model during construction...

Here is a link that might be useful: San Juan Crystal Cove Model

I hadn't heard of this name-brand, but they are sold in the big city just down the road from us. Excellent information!

This shelf isn't quite as big as I'd hoped . . . but it's much bigger than any other I've seen on a fiberglass pool. I think I'll check them out next weekend. Thanks!

Try barrier reef. They have some smaller pools and you can add a tanning ledge that is 9x9 and 10 in deep if you want. We are talking to a builder now and looking at one of the larger models and adding the tanning ledge.

Here is a link that might be useful: Barrier Reef Pools