I have the 3G model and for me it was worth the extra cost particularly as we have regular weekends with my sister-in-law who has no Internet connection at all. The kindle always comes in handy for that.
If you receive personal documents by 3G there is a charge but I'm not sure about buying books abroad - not something I have tried. You can limit what you might be charged on the Manage your Kindle page on Amazon if cost is a concern.
Gmail is no problem - I regularly check emails and write new ones on the Kindle. Never had an issue with this - it's a very handy feature. Some websites work better than others on the Kindle, just a matter of trial and error.
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