Thanks, Jay!
Yes, I'm certainly considering using another pair of Horizon RAAL as my Surrounds. But that would only happen in the future, larger theatre. In my current, tiny theatre, the size would be an issue for sure.
Yup, I'm curious about the 70-20XR + CURV woofer combo. But I just don't think I'm willing to risk that much, potentially, in shipping costs. If I decide to go with the 70-20XR tweeter, it'll be with the dedicated, phase-plug midrange driver as its mate. I already know for certain what I'm getting with that combo, and it's what I want, to be frank