From what I have gathered, recordable dvd's will not be a valid option in the near future - 2-5 years. For a number of reasons, primarily being the resistance to the technology from the film studios. They simply don't want you to be able to record a film off a digital tv broadcast onto a dvd disk, and have it for life. For this reason prices will be kept artifitially high, this initially happened with cd's, as the technology for burners was around for ages before they became afordable, and even then it's still only computers which use them. Why are there very few music systems with them in?
I pesonnaly suspect that the way to go for recording in the home is the black box system. Like the tivo, although this system has major floors. In these systems you will be able to record a large number of programs on digital media, probably hard drives, which are replaceable or expandable. In the very near future a number of manufacturers will be starting to supply tv's with inbuilt tivo like systems which will record whatever you want.
In general look at dvd's as cd's and forget about DVDR for now, apart from anything there are about 4 different DVDR systems comming out, non of which seem to be very compatable with each other, and may end up as speciality products like mini-disks, not mass use products.