What are the differences between the BlackBerry Curve, Torch and Pearl?

I have a Blackberry 8830 World Edition but my company is taking it back so i'm looking for another option. Advice?

The blackberry curve has a full QWERT keyboard which makes it much easier to type on. The blackberry troch has a slid out key board which is also QWERT( this means they has a full keyboard) and last the blackberry torach is pretty much the same as anyother phone but doe snot slide or flip. The only difference is its a blackberry and is available with bbm(as are all the blackberry's)

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