I've been acquiring speakers as I expanded my system...in pairs. Its a real hodge-podge. The front left and right are 1990 Infinity 6ohm RS speakers, the center is a decade old Infinity Video Center, and in my current ProLogic setup, the surrounds are a pair of Tandy Realistic 40w Minimus 7's. Not having the budget or mood to currently buy a whole set again, and stepping up to real surround via a 7.1 system, I'll be adding 2 rears and a powered subwoofer. What I'm wondering is how critical is it to get the rears matched to the surrounds - which is more critical, as I understand, than matching all those to the fronts? Should I get another set similar to the Minimus 7's or just bite the bullet and get a set of 4 matched surround speakers?