DIY mini PC with upgraded 2TB SATA SSD as a Bitcoin node, file server, electrum instance (so you don’t have to broadcast Bitcoin TX info through someone else’s server), running Datum Gateway for mining, and some P2P private messaging.
Upgrade to a 4TB SSD if you can. And join the Start9 forums to meet tons of helpful people.
Get a UPS to provide backup power to your router, internet modem, your start9 server, and your primary PC in the event of power blips or short term outages.