A DVD recorder with a hard drive is the best of both worlds for analog time shifting. One day, hopefully, there will be units that support digital QAM and ATSC although now there only appear to be units without hard drives. Tivo Series 3 is a good example although it doesn't include the burner and many feel it is too expensive.
Much of my viewing is time-shifted material. What's a commercial?
PS - Being a veteran of VCR time-shifting I have to advise that with any of these techs so far, it is always a good idea to pad the recordings: add time at the beginning and at the end. Tivo and the cableco DVRs get their schedule data from several services but the programmers and broadcasters don't always tell when a show is extended.