Actually, most covers at 600x800 would have an incorrect aspect ratio. That would mean they would be stretched horizontally and depending on the cover would look odd.
What I do is go to Google Images and find the best quality cover image I can. Also, by doing it myself, I can sometimes see other cover images and decide which one I like better. for example, UK, AU, and US can all have different cover images.
Then I take the cover image and size it down to 1024 lines and have my cover XML keep the aspect ratio and it works very well. Also, the cover looks good on the iPad if I decide to use that to read.
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