AnyDVD paired with DVDShrink = ALL MOVIES RIPPABLE. (Except Blu-Ray)
The ANYDVD has a free 30-day trial, after that it's $30-$40. Their updates come out within 1 week every time a new encryption hits the shelves.
Couple of things to consider... most DVDs will come in a dual-layer disc, which has a capacity of 8.5GB. Most DVDs (that come in the 50-100pk for cheap) is only 4.7GB. DVD-Shrink will allow you to just rip the main movie without the previews and extras. It'll also compress just enough to fit into a single layer 4.7GB disc. You can also remove the end credits for even better compression.
The ANYDVD will run on the background and work its magic. Once you have it downloaded and running on your taskbar, there's no need to tinker with it. Just keep it updated for the latest encryptions.