Alienware has announced the new Alienware Alpha Console, formerly the Steambox. Alienware is priding themselves on making a fully customizable console based on Windows 8.2. You will be able to bring your entire Steam library to the TV with this new machine and best of all you can go up to 4 players. They will have Alpha playable at San Diego Comic Con where you will also be able to see the UI.
It will cost $550 and be on sale for the 2014 holiday season! This is the cheapest way to get an Alienware machine, so if that has always been your dream start saving your pennies!