That's a great score Daz3d&Confus3d. If you're thinking about going with KEF for your fronts and center now, Onecall has recently started carrying KEF's. And yes, they're still charging $599 for the iQ8D's, so you got a deal for sure. I'm sure you could unload your Klipsch on audiogon.
Which brings me to my next point. No, you don't need to match your rears...for movies. However, if you plan on doing any multi-channel music listening, matching things up may be a bit more critical. With that said, it's all about what your tolerances are. There's no one answer for everyone. Optimally, yes, you'd want them to match. But you may find that the unmatched set doesn't bother you. Point is, give it a listen. If you bothers you that the sound doesn't appear to be as seemless as it could be, it may be time to invest in new speakers. At the same time, if it doesn't bother you at all, stick with what you got. It's all about satisfying yourself, not anyone else.
Oh and one more thing. I couldn't agree with you more. My (previous) Paradigm dealer recently started carrying KEF and I could see them in person for the first time. I was absolutely shocked at their build quality when taking their price into consideration. I don't know how they do it. Good score on your part.
