K2 can synchronize between all of the Kindle platforms as well. Actually, so can the K1.
I cannot speak for K2 to K3. I can speak for keeping the K1 over getting a K2.
I took a look at the list of features on the K2 and decided that upgrading was not worth it to me. At the time my K1 had cost $369 and the K2 was at that price. I liked the option of the replaceable battery (never used it) and the memory card slot (never used it). I didn't think the change in grey scale or the text to speech was worth it. All in all, I was happy with my K1 and didn't feel the need for a K2. I had some serious gadget envy though.
When collections came out I started jonsing for a K2. By then I had seen the DX and knew I wanted a larger screen but didn't want to pay close to $500. When the DXG came out with a better screen, collections, and a price drop I went for it and have loved it ever since.
So my advice is this. Look at the features on the K3 and ask if there is anything on it that you feel you have to have. If not, stick with your K2. The good news for you is that if you decide to go for a K3 it is a whole lot cheaper then $369. (grins)
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