If this is your first year looking at Exchange plans it's worth doing a spreadsheet with some auto-calculating fields based on guesstimates of your number of primary care and specialist visits per year.
One thing that I discovered when I did that my first year was that the big difference between some of the Gold plans and the Silver plans was pretty much only in the minimum amount I'd be paying per month as premiums - the maximum out of pocket was pretty much the same and there wasn't that much variation in my "expected" out of pocket - I was just paying it as higher copays IF we did go to the doctor or as a higher premium regardless of whether we went to the doctor.
Something to watch out for is "coinsurance after deductible" aka "you get bupkis until you've used a lot of care." With school-age kids and probably a minimum of one checkup/physical per year per child plus vaccinations, etc. you might be better off looking for a plan with copays even if the premium is a bit higher. It's also worth looking at the emergency coverage, there can be some variation in there.
Oh, and check the provider network - BCBSIL at least has different provider network levels, so if you see seemingly-similar plans from the same carrier with a significant price difference it may mean that most providers or hospitals are going to be out-of-network which means you pay more.
Good luck
