What you see above is the Acer AspireRevo R3610. It is defnitely one of the coolest nettop PC designs you will come across that also work as a great HTPC. Why? Because it handles HD videos extremely well and plays 1080p video like a charm. Although it isn’t your next gaming machine, with the included NVidia Ion it also works as a decent light weight gaming PC too. It has 6 USB ports, a HDMI port, a 160 GB HD and almost everything else important, that you would truly need.
For $330 this device can definitely fit your budget. It is also very portable and you can just put it behind your HDTV. Overall it is simple and does well what is supposed to do.