gNasty

Got an 09 e350 amg sport w/ navigation. Front center speaker and sub are blown (I read I can glue I'd rather replace). After browsing the forum I believe the general consensus is adding additional amp to remaining speakers works great to prevent from getting a whole new system. Without getting crazy $ wise what are y'all's recommendations for front speaker, rear sub, and additional amp? Preferably all drop in.
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thanks