When I originally read your post, I thought you were looking to purchase some of these speakers. If you already have cbm 170s for fronts, cmt 340s as a center, HTM 200s and cbm 170s as side and rear surrounds, then I wouldn’t purchase anything. Just get wall mounts and/or speaker stands to place your side and rear surrounds, using the Dolby guidelines. I don’t think it would be worth spending any money to swap out some of the speakers with HTM 200s.