Media Center whoos

A while back I wrote that my media center could be a post topic... Well.. it's in operation and does it's job, but unfortunately it's not perfect... Media Center, also in Vista, is still an application, so the core operating system is exposed too much.. also the remote control and remote keyboards have there strange behaviors... but the worst of it all is that at random moments it wakes up from sleep and doesn't go back to sleep anymore.. I've tried everything that could be found in forums and blogs.. but nothing helps.. I'm even considering building a new one now.. all on mobile components and completely passively cooled that it can just run 24hours a day... ;-)