Apple TV box is disposable electronics at best. Spectrum (bastards) will replace the cable box for free. The router is likely toast. I'd open up the Sony and Marantz and check the fuses in the switch mode power supplies with a meter. The problem is that both those units are in constant standby mode, and hence susceptible to such problems. Since the strike entered via the network ports, I'd say there's little chance of repair.
I would also go into your basement, and check to be certain Spectrum correctly bonded the incoming CATV line to your cold water pipe or ground rod. If Spectrum failed to do so upon initial installation, you could get all your gear back and some.