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Well first off, the screen flashing occurs only with e ink displays. The way e ink works is that there are little drops of dye suspended in bubbles and when an electrical charge is applied, the dye rises to the surface or drops back down. The flash you see is when the dye is removed from the page and then reassembled because a new electrical charge has been applied. I didn't notice it either after the few minutes so I wouldn't worry over it. However, if it bothers you, the only other option right now is an LCD reader or a tablet. The LCD readers tend to be cheaper anyway, but the battery life isn't nearly as good and many people say it gives them a headache to read from them. Then of course you have the tablets like the iPad and others which also use LCD screens, though those are color. Again, since it's not e ink, there is no flash.
Good luck with the new Kindle whatever you decide.
Edit: Of course if you wait a few years, other technologies may be on the market by then which don't show the flash.
Eric
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