Do you lose enhancements if using TiVo?

Tivo outputs the same resolution all the time, NTSC 480i. The difference in recording quality from stand alone TiVo boxes is that there are greater compression artifacts like pixelation and macro-blocking when going to a lower quality.

The TiVo that is integrated with DirecTV's service, like the Sony SAT-T60, Philips DSR6000 or Hughes HDVR2 record with absolutely NO LOSS in quality. None of the current units will record anything beyond an NTSC 480i signal, though.

An HDTV Tivo is due to ship later this year, but there is no shipping date yet, nor a price.

Nrenter, while what you say is true for stand alone TiVo boxes, it is incorrect for the integrated TiVo boxes like the Sony SAT-T60, the Hughes HDVR2 and the Philips DSR6000, which record with NO LOSS of picture quality whatsoever and are able to record dolby digital as well. The newer HDTV TiVo units will be the same way, with ZERO loss of picture quality, as they are recording the exact stream that is being sent in the first place.

Stand alone units have to take the analog signal being sent to them and run them through an A/D converison and compression, then do a D/A conversion when it is output. If you want TiVo, and anybody who has ever used one for any appreciable length of time does, then go with the best one there is - the integrated DirecTV units mentioned above. In addition to being better, they are substantially cheaper.