The family got together and bought me the large DX for Christmas couple of years ago
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I really like it, I don't think I'd be happy with the smaller ones however the wife is happy with hers- depend if you are willing to make the tradeoff of weight versus font/(number of characters on the screen) size and dollars.
The big one is much better at handling pdfs, I like it for for reading schematics, wiring diagrams, maps.
Much bigger and heavier tho, the small ones will fit in a purse and is fairly light.
Since our phone data plans are so freakin' 'spensive here I don't have. The kindle with 3G comes in handy on the road to look up addresses which I can plug into the GPS.
3G Web browsing is slow and very awkward. Of course the Amazon store works well
and books dowload in seconds even when cell reception is naught.
Annoying that many books cannot be "loaned" to another kindle. Lots of free older books see Guetenberg project online.
I'd set up a US Amazon account and link to that, many many more books.
The only limitation is that magazine and newspaper subscriptions won't work without extra fees but I don't use those.