Haven't bought speakers in ages, but good taste on the Klipsch! Always a true sounding speaker. I'd pair then with a warm sounding receiver or amp.
I don't have time to research, but I've always preferred a fuller range rear. Honestly, it depends on the space you have to work with and the funds. I might have even gotten some fuller rears and even skipped the sub till last, since they would all be able to handle the full range... This is coming from someone who has been living in a smaller pad lately, and has been using a borrowed HTIAB, with sub/Sat speakers. (I really miss full range) If I had room (and the funds), I'd always go with the fuller, better matched sound all around. The very best sound would be putting those same front towers you've got there in the back, but there are multiple reasons that this could be unrealistic.