Look we want to to go big as possible but my dad said not tank bigger than 250 gal. So ok I want some thing aleast 160 gal for the display! So Red Sea and elos are my two top options for new and know manufactured tanks. And if I go Red Sea it will be the 750xxl. But we are still in the planning stage!
You're obviously not in a rush and doing your research so why not just have a tank and stand custom built by Planet Aquariums through FJW or OceanLife or other LFS/sponsor?
Will be much cheaper than Elos and be the exact dims you want. You could also go ReefSavvy but that will take like a year instead of several weeks.
Personally, I was tired of waiting for custom tanks to be built and I was severely downgrading from my previous tank when we moved to a smaller house.
The only reason I was willing to go Elos was because I had the cash from the sale of the old, much larger system. And i just wanted something off the shelf this time.
Still had a custom sump built though.
You'll have so much cash leftover to spend on the best equipment, and still be ahead.