So in my basement I have a 36U HP server rack that I got off of Craigslist for around $200. It is 350 lbs and getting it home was a huge challenge; the person who buys my home will inherit this rack; I think next time I do this I'll get a freestanding rack that's a lot cheaper and easier to set up.
Anyway that aside... I have a TP-LINK VPN router that intakes my cable modem connection (100/50 -- Optimum is great!). That plugs into a Dell 48 Port switch on a single VLAN (no need for multiples). I have an i5 server with SSD and 2x2TB drives in mirror that acts as my HTPC and Media Center (the Microsoft one). Attached to that is a Ceton card that records all my TV, and distributes that to two XBoxes in my family room and bedroom (so I can watch live TV and DVR). That setup is amazing. Additionally I have Media Browser (http://www.mediabrowser.tv) running to 3 Roku boxes in the family room, bedroom, and living room.
Every bedroom in my house gets two ethernet jacks. The kitchen and family room also have two. I also run Unifi POE Access Points on each floor of my house (they are great) to do my wireless; I don't have a wireless router.
That's about it... it's a great setup that saves me a lot of money on my cable bill (no boxes), provides a lot of flexibility for content I watch and stream, and it's all backed up to a cloud backup, Crashplan.