This must be 7.1.2? I would choose Monitor Audio for the heights, surrounds and rear surrounds. Obviously they don’t HAVE to match but ime speakers from a matching line or manufacturer at least will be more seamless than speakers from different manufacturers.
Also, ime 5.1.4 is better than 7.1.2 and would consider switching from a 7ch bed to a 5ch bed. Any other pics? I would also move the current/new heights off the front wall and use a side height if you have a side wall, and can’t do a ceiling mount.