I'm looking for help from people who have direct experience of Xbox 360 utilised as a WMC extender.

I have a Win 7 HTPC running WMC which I use for terrestrial Freeview via a networked HD Homerun Dual.

I want to get a second hand Xbox 360 in another room as a WMC extender. It'll be on a wired network attached via HDMI to a TV. It won't be used for gaming at all, just TV and maybe playing media off USB sticks.

My question is what 360 I should get to achieve this? I want to go as cheap as possible, and as quiet & energy efficient as possible. Doesn't matter what it looks like, or whether the controller is wired etc.

I know the S and E models are quieter and more efficient so I'm looking at those primarily.

On Trademe there is a big selection but it's hard to sort through without knowing which ones I can weed out.

e.g. There are some on trademe without HDD. Google suggests they will work in some instances for gaming without HDD, but I can't find anything about the extender function.

Also are there any pitfalls I need to know about?