Mac1
Interesting read. I too do not buy canned computers, but put the components together myself. That way I get the performance and upgrade path to my liking, not some generalized box. HP, while they make very good computers allow very little non-HP upgrades. Dell is similar.
You said your ISP charges extra for WIFI. ๐ฎ Cut that cord!!! Get a simple cheaper non-WIFI modem from them.
Then buy a WIFI Router and install it between the PC and Modem. That also gives you 4 LAN connections, or 3 free for other devices. Try to get a good high power router, especially if you have a large house or multi story house.
Set it up on WPA and register every WIFI device (friends and relatives too) that will connect to it. You just need to define the devices MAC address to the router, and the password to the device. That way they automatically log in when booted or come in range.
Nobody else can get in, even if they know the password. ISP WIFI Modems usually just need a password, their password, and the modem ID.
I have a Cisco router. You can access the Administrator page from any registered device, or the PC with just its static IP Addr, Admin name and password.
It also has a Guest access for ad-hoc access with a separate Password.