As a current owner of Kef Reference 2~2's, these are my thoughts. The rears do very little when it comes to music and HT. The fronts and center do most of the work besides the sub. The XQ is way ahead of the Q series. You could also look at last years model of Reference (2~1,2,3,4). You need to decide if this setup will also do 2 channel or not. If it does, then buy the 205's or 2~2's at least and add the XQ3's as rears or even some RDM's(used). The Kef uni-q sound is important to maintain but it is not neccessary to have the same group in one room.(ie all reference or all XQ or all Q)
My only regret in my system is not going separates from the first. buy a used good receiver and a great amp if you can't find a reasonable processor. I just picked up an Anthem MCA5 series II(200w per channel @8ohm) amp to go with my Integra 8.2 receiver. The Integra drove the 2~2's okay but the amp added lots of dynamic and sonic improvements. These Kef can really use lots of power to show their true colors. (BTW, a THX select receiver has the exact same processor as a THX ultra receiver except that it's amp is rated for a smaller room.)
Sorry about the rambling.
My only regret in my system is not going separates from the first. buy a used good receiver and a great amp if you can't find a reasonable processor. I just picked up an Anthem MCA5 series II(200w per channel @8ohm) amp to go with my Integra 8.2 receiver. The Integra drove the 2~2's okay but the amp added lots of dynamic and sonic improvements. These Kef can really use lots of power to show their true colors. (BTW, a THX select receiver has the exact same processor as a THX ultra receiver except that it's amp is rated for a smaller room.)
Sorry about the rambling.