We need pics IMO the style of the sectional needs to be considered and I have to say a round ottoman would not be my choice with most sectionals so post a pic.

Check out Lazy Boy

Room and Board has their Lind ottoman, which you can customize the leather and is 42"

Hi - Here is a picture. its 8' 5" from left to right and top to bottom. Its a big one!

What are your goals? Places to put feet up, or places to set drinks? I prefer side tables (and/or a console table behind the couch) for drinks.

A rectangle ottoman will give more people space to put their feet up, and more room to add a big tray when you want to use it as a table.

I should add that we do not like the coffee table pictured. it has an inset that is very annoying.

main goal is to find something that looks great with the couch. given the size, i dont know if rectangle will work?

What about two or more instead of one huge one? They’d maybe be more functional, especially with younger children. They could easily be moved around for everyone, wouldn't be as bulky, and there’d be a lot more selection out there.