Unsolicited advice #1:
If you end up being able to fit either the round or the oval - I suggest the round, they're cheaper and mechanically simpler - the verticals and buttresses on the sides of an oval have to provide significant resistance to the water. Plus you can make a whirlpool in a round pool by everybody walking / swimming around until the water's flowing round and round - Fun.

Unsolicited advice #2:
Get and learn to use the K-2006 before your pool's installed. In my opinion, it is the single most imnportant start-up chemical for a pool, next is water.