Wheels & Tires - Replace 2 Eagle F1 tires or replace all 4 different brand for same price?

My 01 ws6 has a set of eagle f1 all season tires and I really like them and i love the looks of the tread pattern. The 2 rear tires still have alteast 75% tread but the front tires are on their last leg. These damn Eagle f1 tires are so expensive. Should i buy 2 Eagle F1's or buy a whole new set of 4 tires for nearly the same price as the 2 eagle F1's?

My car is a daily highway driver. Let me know your thoughts.

I'd only buy the two. Why replace the rears if they don't need it?

I usually by two front and rotate the fronts to the back.

If you can get the 4 for not much more, get all for and keep the two rears as spares.

I tend to get a lot of nails due to where I work, so a spare is a good thing to have.