Hi, I had Mission M7 bookshelf speakers matched with a M7C centre and M7DS bipole rears, but recently replaced the fronts with Dali Zensor 3s. Unfortunately the centre is now a jarring mismatch, so I'm looking for a second hand Dali Zensor Vokal to match them. Would the M7DS bipoles still be good rears, or would Zensor Picos (or something of a similarly compact size) be better? Also, would a subwoofer be a worthwhile addition, and if so, what would be a good match? The room is about 4x6m, rears would have to be wall- mounted. The house isn't well insulated for sound, and unfortunately I do have near neighbours! Thanks!