Mix Goodyear and Cooper???

I've never rotated my tires (Goodyear P255/65R18) on my 08 Outlook XR FWD that just hit 30,000 miles. Combination of being lazy, tire place telling me to keep the better tread on the non-drive wheels, and reading several reports that rotating may not be worth it in the long run - just replace two at a time and skip the rotation charges.

I'm about at the point where the fronts need to be replaced. They have worn evenly, just getting thin. The backs still look new.
It looks like Cooper offers a cheaper alternative to the Goodyear. Any issues with moving the rears to the front, and putting Coopers on the back?