Pistol Pete1:
I use QED micro for rears on my Q Acoustics package.
I did have the QED Silver Anniversairy at the front and centre, but found that using QED Profile 4x4, but as single cables (it's a biwiring cable) made a massive difference. It became a much more clearer and detailed sound.
Since upgrading my fronts to the 1030i (as mentioned in your other thread), I have now bi amped the fronts using the same QED Profile 4x4. This is all using the Onkyo 606 amp.
As for your system (QED Profile 4x4 is not made anymore, but can be found on ebay), I would suggest trying the QED Anniversairy XT for the fronts and centre .
Hope that helps....
Thanks - btw, would love the 1030's but see my other thread, room layout rules out floorstanders