The scan resolution is only one contributing factor to scan quality. The difference between an identically sized 300 dpi and 600 dpi scan is negligible compared to the difference between a CIS and a CCD (better) scanner or the difference between 50% and 95% JPG compression. I'd make sure you have a CCD scanner, and then play with your JPG compressions settings first before I worried about the dpi. Additionally, software adjustments like sharpening will also effect the finished scan more then dpi.
Now, if you are displaying the image at 400% actual size or photo printing, then scan DPI becomes more important.
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