I've got the Dish Network DVR and want to get a DVDR to back up programs. I've been looking at the Panasonic E50 in black -- however this unit doesn't have its own hard drive. If all I'm doing is connecting the DVD recorder to the digital video recorder, is having a hard drive on the DVD recorder really necessary? The E50 is appealing for 2 reasons: 1 is that it's in black and 2 is the price. Any advice??