The resolution of the Aura screen is 1024 x 758. That is probably the best size if you are only worried about the Aura. But, screen resolution will only go up and you have a lot of other devices. I recommend using the best image you can find. Then you can:
- Make sure the cover page is correctly displaying the cover image as large as it can without distorting the image. The calibre options to insert the cover in an epub should do this.
- Send the covers to the device with the books. This is done with options in the KoboTouch driver. Selecting the "Keep aspect ratio" option will put the cover on the device without distorting it.
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