Simple question: is the Sony giving you trouble?
Are you having trouble reading or wish it had an important feature?
Or is it just "gadget itch"?

If you have a satisfactory reading experience today, don't fret what others are doing/getting. It's not about the gadget, but rather the reading, right?
Besides, you can always wait for the Kindle4 to come out next summer and one-up all your K3-loving friends.