Well, the CableCARD v2.0 stuff may be out in 6 months, or it may not. Unfortunately, that's what's holding TiVo back; sure, they could do an HDTiVo for OTA HD content, but it wouldn't work with satellite or cable. You're going to be in the same boat with anything but the cable/sat providers own HD DVR solutions.

I am the Doctor, and THIS... is my SPOON!