We are thinking along the same lines with the subs. If you get 5A's I would still get the extra 2WQ sub for the rears for the same reasons you mentioned above.
My rear 2WQ's get alot of action in both movies and multichannel music, even when I engage my LFE subs. They sound better than using my rears alone (I have VSM sigs).
BTW: I redirect the bass from my center channel to my main speakers. I think this is the best option with the VCC-5 once you get 5A's or augment your 3A's with 2WQ's as you lose directional sense of where bass is coming from.
Thanks for the advice on the video cable. And the tuning feets sound very interesting.