Even if you don't want to deal with verifying your income (but think your income will be low enough to qualify for subsidies), it still seems like a better idea to buy a plan from the ACA marketplace, pay full price, then settle up when you do your taxes.
This web page offers some scenarios where shopping outside the ACA marketplace would make sense - Private Health Plans Outside the Marketplace
I suggest you check out the ACA, with a family of 6 you should get a huge subsidy, unless, you have a huge income. Yes, you may need to pay up front and get it back when you do your taxes.
You do need to figure out what doctors will accept the ACA plan and if they meet your needs.
My doc doesn't except it.
I'm still on a grandfathered plan at $8,700 (hmm, I think it just went higher) for a family of 4 with a $10,000 deductible.
I don't recall exact numbers, the ACA was about $15,000 but I would get about $10,000 as a subsidy.
It's not hard to poke it into the Healthcare.gov website, but you will need to sniff around to find the button that allows you to just check the price without signing up. It's inside one of the dropdown boxes.