Buy a top modem router combo ,the motorola 8702 is very good it has Docsis 3.1
but a good Linear power supply ,4 amp and up 12 volt , the Linear Tube Audio
is the best LPS under $1200 for $750 a steal and makes a very good improvement
and I bought a good Ethernet switch with a OCXZo clock,LPS ,and low noise regulators ,the SW-8. But good quality Ethernet cables ,and a top usb cables .