That would be a great box for that purpose as long as you can work out a control scheme and front-end that you can live with. I suggest XBMC and either a Rii or a Logitech k400r if you'd like a device that's a bit larger.
The one down side in XBMC is that streaming plug-ins can be fussy, but you really want SOMETHING to give you a 10' interface to Netflix/Youtube/Amazon. Plex Desktop (or the Windows 8 app-ified version) are both also credible, though Plex has a much more limited set of streaming options.