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The 600x800 pixel (3:4 aspect ratio) works well on "traditional" eInk Kindles. When viewed on tablets (Kindle Fire, iPad, smart phones, ...) the image may not fill the display. Most tablets have a different aspect ratio than 3:4 (Fire=~3x5, 600x1024 pixel) and few reading apps will automatically scale the cover to fill the display. There is no good, reliable way to make the cover fill the display with no border on all devices and apps.
In general, if the cover image is centered left to right in the original source document it will display centered on the Kindle device/app given good conversion methods. I've had no problems with ePub>MOBI conversion in either KindleGen (via Kindle Previewer) or calibre.
Increasing the image size to match the Kindle Fire's display resolution may work for now, but when the device landscape changes who knows. Certainly, using a 600x1024px image will leave borders on the eInk Kindles (read: most Kindles in use today).
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