I have the HD Tivo myself and I love it. I think you will too if you go that way. Only real complaint I have is slow menus and guides. Otherwise it works very well and the OTA HD tuners pull in channels my 2 previous units did not even see.

Only thing you should consider is this: I agree that D* will upgrade our older units at no cost, but that will not happen until the MPEG-4 locals are in your area. I'm not in a top 30 market so it will probably be a few years before we get the HD locals and therefore a few years until I get the free upgrade offer. If you are buying now expecting the upgrade soon, check your market. You may wind up waiting for awhile before you get the offer.