OP you can share annotations with the wifi only model too so no worries there. It simply means that if you're not in an area with wifi, you won't be able to buy/download books or browse the web. If that doesn't bother you then wifi is the way to go.
I got the 3G because we often stay with my sister-in-law who doesn't have an Internet connection and by taking my old Kindle with 3G meant I could still get to my favourite mobile websites.
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