Ok, if you don't like AutoGK for some reason try this.
Decrypt and rip the dvd to the hard drive using whatever program you like (AnyDVD, DVDFab, DVDDecrypter, etc.). Personally, I'd just rip the main movie.
Download and install AviDemux. http://fixounet.free.fr/avidemux/ Within AviDemux, open the VTS_01_1.vob file of your decrypted dvd. You will get a little pop up window that says this looks like mpeg...go ahead and let the program index the files and append them (join all the vobs together).
Now you are ready to start setting up for your avi file. Under Video, select Mpeg4-ASP Xvid. Now click on Configure under that. Put Encoding Mode to Video Size (two pass). I suggest using a larger target size than 700 or 800 mb if you want the best quality. If your player cannot handle anything more than 1.4gb, select a slightly smaller size. 1.2gb should be fine. Click OK to close the Configuration window.
Next, under Audio, change to MP3 (lame). Click on Configure to set bitrate...default is 128. Then click on Filters and set the Mixer to Stereo. Click OK to accept these settings.
Finally, under Format, set it to AVI.
Now, at the top of the main window, click on File and Save. Set your output location at this time, and make certain to give your saved file an .avi extension. Once you click ok, you will start the encoding process.
This should produce very good results. Speed is dependent on your computer's cpu speed for the most part, so if things are going slowly, you need to invest in a better machine.