As far as mixing sealed with ported I've never actually tried nor do I have much input outside of its not recommended. I've read it can work, but it takes some careful implementation.
If you bump the budget a bit I think the
Denon X3500H might work out for you. It comes with Audyssey MultEQ XT32 for room correction and better for you, 2 independent subwoofer outputs. It doesn't have onboard PEQ, but for $20 you can dl their editor app and it gives you some more control. You can save multiple curves too, which is nice if you like swapping out speaker sets like some people I know...