Having owned a number of AG pools over the years, from a 15' to an 18' to finally a 24' pool, I can easily say that I wouldn't own anything else. Here are a few pointers.

1, Watermom is absolutely correct, the biggest pool you can legally fit into your space is the way to go.

2, Have it professionally installed, and make sure you get a permit for any electrical or plumbing work.

3, Make sure you get a filter that is rated for a pool that is larger than the one you are buying. Sand filters are my personal preference.

4, Once you're pool is up, try using the BBB method before being "pool stored" into buying a bunch of things you don't need.