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Of all the "one-click" solutions, Auto Gordion Knot is simply the best. Unlike the others, AutoGK does not do the work directly. It is just a front end for some of the tools that the prosumers use, i.e. VDubMod, DGIndex, Avisynth scripts and plugins, etc that do the heavy lifting in the background. The other tools you mention just won't give you the same quality at a specific size/resolution.
You can set your encode for a specific quality level OR a specific size. I have found that near DVD quality can be obtained using a fixed width of 720 (keeps the same resolution as on a DVD) with the quality level at 75 using Xvid. For a 2 hour movie, this results in about 1.4 GB. If the movie is complex, then more, and if simple and slow, then less.
If you want to encode for your device, I would use a fixed width of either 640 or 320 (probably 640) and start with a quality around 70. A good rule of thumb for a QVGA device for the average movie is (length of movie x 3 = target MB size) and for a VGA device (length x (5 to 6) = target MB size). Use those guidelines for a slow movie to determine a good qualtiy number to shoot for. Then, when you encode a faster movie at the same quality number, you will get similar quality, but at the cost of a larger file.
HTH
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