In short, 25p and Cine are just presets, that use different gamma settings. The Cine one uses Cine-gamma, hence the name. Learn the settings, learn what each of them does (use your eyes and the book) and you'll be able to change presets to your liking. I, for one, got rid of 3 50i default presets on the first day I got my DVX and replaced them with more 25p options.