Probably the answer you're looking for is '1', but just to make sure: You crop into the picture to a mod16 resolution because you should under no circumstances leave residual black lines on the borders. You loose some pixels on the borders? Who cares? You don't, absolutely don't use any resizer because this utterly destroys the idea of leaving the original picture intact. You don't get any notable aspect ratio error because you use Pixel Aspect Ratio and resizing on playback also works with odd resolutions; it will also resize to 1022x or whatever.
Anamorphic has one big advantage over resizing: smaller artifacts (blocks and rings)...
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Plamen234, I've merged your two threads which are on slightly different aspects of the same subject. Please try to keep a discussion within one thread where possible. To answer that other question: If it's only the main movie onto one DVD-R you should have more than enough space to stretch the movie before encoding. If you also want to put the extras onto the DVD-R perhaps not. Just my 2 Cents.
Do a compressibility test using to decide. I'd say, try a filesize prediction with the SixOfNine CQM at constant quant=3 - if the upsized movie is predicted to come out too large at quant=3, I'd go for anamorphic.