I'm building a 13x40' pool (size driven by space constraints). We want saltwater, heated, and inset a spa on one side and a small sunledge than steps on the other side. Also doing Quartz or pebble, auto pool cover, able to make changes to pool on iPad, auto fill. What other features should I ask for? Any advice on pool coping and patio? We like blues and greys. Pool will be in sun most of the day. We have 6yo boy. Also any ideas re how to save money? Estimates are coming in very expensive. Thoughts on Quartz vs pebble? Will that save me a lot?