Smallest PC to run XBMC

[Mark M]

CAn someone recommend a system that is very small to sit in the tv unit and is ideally silent or at the very least no louder than a surround sound amp fan. Its to play some 1080p content but nothing higher than that.

Thanks.

Edit - looking at spending the least possible to meet the above requirements.

 

[Mark M]

Thanks for the suggestions. I was leaning more towards a PC based setup due to the fact I want to run some addons on it and thought that I would need to be a PC rather than a Pi or equivalent?