There is actually a LOT of difference in AG pools. I had never realized this until we were shopping for ours. The models and prices vary greatly and so does the quality. We wanted with the one with longest warranty. The pool itself has a lifetime warranty, and if I remember correctly the liner has a 15 year warranty.... ????
Do you have a Rec Warehouse in your area? They have a huge selection and very knowledgeable sales staff.
They were more than willing to explain all the differences and the pro and cons of each pool. I was impressed because the salesman took the time to show us everything they have to offer. He started with the cheapest, bottom of the line and worked his way up to the higher end pools. This is the best way to see the differences!
(I don't mean for this to sound like a commercial, I have no affiliation with them, but they were very nice and helpful to me. Doing business with them was quite painless)
You can actually negotiate with them on the price and equipment package, so don't fall for the first number they give you. If you act like you are going somewhere else to shop around the price will suddenly drop and they will start offering to throw in freebies. We ended up with upgraded steps, a 2 speed pump and larger filter, Baracuda auto vac, another manual vac, tons of misc. accessories, 1st year of chemicals including a winterizing kit (Baquacil

yeah I have to admit we got pool stored on that one)
As for the depth, I'm no expert but I would assume that is just a matter of personal preference.
Please keep us updated as you go! (including pics!)
Don't get pool stored on the chemicals, BBB is the only way to go! If they offer you some free Baquacrap you can always sell it on Craigslist! :lol: