many choices of blackberry bold and torch

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I have seen many choices to buy new blackberry, Latest one in my country is Blackberry bellagion or onyx 9790 and previously dakota bold 9900..as well as Torch 9810 and monaco 9850..All of them comes with OS 7 which guarantee faster on browsing and any other application.. They also came with capacitive touchscreen, but there are big difference on the size of the screen, Torch has larger screen since it sliding type blackberry while both bellagio and dakota is smaller but lighter and slimmer than those torch blackberry..So I am confuse to decide which one I should buy, maybe anyone has recommendation for purchase those kind of blackberry? I know that the price range is quite different, bellagio is the cheaper ones while Dakota is most expensive...