I wasn't aware of Velocity Micro being an approved CableCard vendor for Media Center PC's but it looks like they are.
Configuring an HTPC with a single digital cable tuner, Blu-ray, and X2-4200+ will run you $3,000. The Blu-ray burner is responsible for 800 of that total. Is HTPC nirvana near? Its close but the shackles of DRM seems to be holding things back. Well that and Microsoft's unwillingness to create a client server architecture.