Hey topknot,
Keep in mind that you can try the Kindle for 30 days and return it if it doesn't work for you (I think it will
). There are a couple of posts around here with deals of $70-$100 off the Kindle right now making the price $260-$290 if you qualify. You can order the Kindle and then go to a store selling the Sony and compare the 2 up close and personal, then make your choice.
Good luck with your decision.