I have the dish DVR 625 with internal 300gig upgrade 300+hours recording time dual tuner with UHF remote with enabled infinite external USB Storage capability and a
Pioneer Elite DVR 57H with TiVo Lifetime with infinite storage to DVD and 340GB TiVo Hard Drive Upgrade and external USB Storage capability
here is the link for the upgrade on the pioneer Tivo Hard Drive Upgrade | Tivo Upgrade | Modify your Tivo
the VP-7021 is all software defined using MyTheatre and DigitalTV I get the "free 2 air" programming which allows me to record right to my harddrive on my computer as well so there are 5 options for recording which is networked to both DVR's.