Matching wattage between speakers and between speaker and AVR is not that important. You mainly want to make certain that the Amp stage has enough power in terms of Wattage and Current to satisfly the needs of the speakers you are driving. (ie, a speaker with giant woofers and a very low impedance and hard phase angle at the low impedance point will likely need a more robust amp).
The MA speakers seem to all be fairly easy to drive and are decent sensitivity, so you should have no problems sticking with the Bronze line.
Keep in mind, you do not need to match up your surrounds the way you want your mains and center matched.
Nothing wrong in matching them either, though.