Help me spec a Gaming HTPC system

[spoony77]

Hi people
I'm looking to build an under the tv pc for xbmc and steam gaming, with a max budget of £500.
I want to game at 1080p with a good framerate in modern games
I already have a ssd drive ready but need everything else, any advice appreciated.

 

[spoony77]

Would prefer a Silverstone style flat case if possible or do these provide insufficient cooling for gaming?
Also I dont require a hard drive at all if this helps with budgeting.

 

[spoony77]

That looks excellent thank you. I've never really used amd processors before but I assume this chip will hold its own in games?