I have a dreambox 500 and 7000, I love them both, if your a little computer savy the 500 is a much better value, the 7000 is just easier to setup pvr as you can use internet harddrive insted of a network storage.
it doesnt have blindscan though, which sucks, but I use my merucry II to scan and move the motor, when I find a new freq its easy to scan with the dreambox, just type the freq in and press ok, once its got the freq it finds the channels as well as my mercury.
dreambox defn isnt as user friendly but it has some pretty powerfull features if your willing to put the time into it.
$200 and you get a pvr (though network storage) and also can stream 4:2:2 and HD to your computer and have your computer decode it. basically streaming content is like having a usb tuner, you can change channels with the web interface and use your coputers to decode.