With my setup, a third tower wont work so will have to be a center. I was just in love with how big the RC-64 is and at least, listening to a test in youtube (and yes, hard to really judge sounds that way), whenever they switched from the 504 to the RC64 (version 3 though not 1) the soundstage felt so big. Although sometimes a bit "messy" in balance compared to the 504C.
Sadly the local person selling the RC-64 version 1 has RF82s not 83 (was asking $850 for all 3). So I must think which way to go.
Thank you!