And just to throw another option out there for you, have you considered Windows Home Server 2011? Yes, it would mean paying MS, but the price is now only $50-$60 and it can offer a lot more functionality such as taking care of your backup strategy, housing an InfiniTV (which I know you’re looking to get) to share amongst multiple HTPCs, file server duties, remote access to all your PCs, audio and video serving and transcoding on the fly when you are away from home, etc.
