Are you looking for a Standalone, or a DirecTV / DVR Combination unit?

Standalone TiVo - High Definition for cable

Standalone TiVo - High Definition for antenna

TiVo Mini (For cable, requires separate main DVR with 4+ tuners)

DirecTV / TiVo - Standard Definition (Existing DTV subscribers)

genie DirecTV DVR - High Definition (five-tuner) (Existing DTV subscribers)

DirecTV DVR - High Definition (two-tuner) (Existing DTV subscribers)

DirecTV TiVo (New DTV subscribers)

I'm not sure...