I've backed up my entire DVD Collection, and you have absolutly NO reason to buy a dual layer DVD. I have a 50" Widescreen High Def DLP Samsung TV with a 1000w Surround sound, the copy compressed looks just as good as the original. I am talking about 57% compression too..
Copying DVDs isn't illegal as long as you are backing up your own private collection for personal uses only.
I always strip out the menus and special features, cause I just wanna put the movie in and watch. No fast forwarding through stupid trailers or looking for the remote to press OK so I can watch a movie. By the time it is over, I have something else to do...
Whoever said it takes an hour or two to recompress a movie is retarded. It takes 1hr to recompress an entire movie to 60% on an Intel Pentium 3 500Mhz. It takes me about 10-20 mins to get it down to 50% on a AMD Sempron 3000+ running at stock speeds.
I would use whatever media works for your DVD player and is cheapest. I've never had a DVD Burn fail and I use the cheapest media on the planet. 1 DVD I've had is messed up, only because my friend felt like "burning" a CD with a lighter...
I highly reccommend DVDShrink and DVD Decrypter. If you are retarded and dont know how to any, I reccommend DVDFab Express. You put the DVD in, chose either Complete or Main Movie Only and click copy... Simple as that...