If I were you, I'd consider getting one with a Freeview decoder too. After all, terrestrial analogue is going to be switched off soon. This will also allow you to record the digital signal directly instead of it going from digital to analogue and then back to digital again.
Have a look here:
http://www.radioandtelly.co.uk/pvr.html
http://www.dttboxes.co.uk/pvrs/index.html
Some HDD recorders have a removable caddy. If you could find the mating half then you could presumably plug it straight in your PC.