Perhaps a good package for use as an orbiter:
http://open.neurostechnology.com/content/Silent_HTPC
They have switched the MOBO to a ASUS M3N78-VM, which has the integrated geforce 8200. The thing is effectively silent (apparently)
Presumably you could DIY for the same price or cheaper, but for those who just want something ready-to-go, this should work wonderfully with LMCE, right?