On my current setup I have KF-28's in the front, KC-25 Center with some RS-42II for surround and KS-14's in the rear. Also running dual front and rear reference 12 inch subs. All powered by a Yamaha RX-A3000 and an external amp for the rear surrounds. I have the opportunity to get my hands on a new pair of RF-62II fronts and RS-52II surrounds for a ridiculous price. A few questions:
Would upgrading to the RF-62II's in the front be that much of an upgrade or more of a side step? Dual 8's vs dual 6.25's.
How quickly do you think a center channel upgrade would need to take place? My main concern here is if I move the KF's to the bedroom (way oversized for the room), my current center (RF-42) will be way undersized. I also have a set of RF-42 fronts that would no longer have a home.
I have a feeling that if I start this process it will turn into an avalanche of purchases to get everything all matched up.

Thoughts?