Know it's long in the tooth, unsupported, etc. but Windows Media Centre is still my favourite big UI to use as a hub for all of my media.
Currently using an old-ish HP ZBook Studio Laptop (Xeon E3-1505M, 16GB RAM, 512GB SSD, Quadro) that sits on a shelf in the cupboard running Win 7 and connected to a Thunderbolt disk array and Ethernet. It has a quad-tuner for Freeview hooked in through USB, and serves up media for the house.
Picked a few Xbox 360 E's and media remotes and use them as media center extenders and as long as you're not doing anything online Media Center works great. For Netflix and the like we just use the native Xbox 360 apps which can also be controlled with the remote.
I've tried out Kodi and a few others but always find myself being drawn back to Media Centre for its simplicity and smooth and fluid UI. I get why Microsoft abandoned it but I wish they hadn't :(