Welcome to MobileRead.
I'm sure that you will enjoy the Kindle. I know that I have enjoyed the Sony Reader I have (and the screen on the Kindle -- the same as the new Sony screens -- is far better than the one on the old Sony.)
My wife is very happy that I have the Sony and that I have been clearing out bookshelves over the past 16 months as this creates more space for her books -- sewing, quilting, and cook books are not the best presented on a black and white 6" screen.