I have this unit and love it, now that I've gotten used to the functions, features, etc. But (yes, there's a but), I'm afraid that the 80 GB HDD won't be enough. I want to be able to record tons of stuff (and I only record in SP, most likely my problem) and am afraid the HDD won't last me long enough. Do they sell bigger HDD for this unit or am I just going to eventually have to delete some of my programs or use another rec. speed? Thanks in advance!