Mac Mini as Media Center / File Server

I have recently added a Mac Mini to my home network, and am trying to determine the best place to put it, and how to use it. Unfortunately for me, I use an older television set, it's a Sony and I think it's 27". Yep I know it's small (and big if ya know what I mean), but it works great. I've linked the Mac Mini's video out to it, and it works ok, although some of the media players I've used don't work great they do work. About a month ago I bought a Roku box and have it set up in my bedroom and just really dig it, so when the opportunity to take the Mini home from my business came up (another story) I decided to try to do the same type of thing with it in my living room. Now I can watch Netflix downloads, and Hulu, and TWIT, and Revision3 from either the bedroom or the living room. It's pretty nice but I am not sure which media center software I like. The content is similar but different on all of them somewhat as is the interface.