Well, actually you'd be better served if you started bigger... 1600x2560 (that's 1.6 ratio width to height)... that's the image for Amazon's product page... new image guidelines from last summer. Most of my clients go even larger though. You can always size down, but not up without loosing resolution. For the actual eBook cover on the book... I embed in the epub and mobi files an 800x1280. 72ppi cover in the metadata. Amazon actually suggests 300ppi for the product page cover. iBooks wants the 1600x2560 pixel cover too.
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