I am currently planning on upgrading my system. For front speakers I am looking at the KEF reference series, or possibly the new XQ series. However, for rears I am undecided. The usual problem of space is a big factor, my sofa is against the rear wall, so a 7 speaker setup would only be possible with small wall mounted speakers. I thought of having 4 KEF eggs, but would these be up to it along side expensive fronts? Would a single pair of XQ1's or something similar be better? Any ideas or recommendations?