Not much for doing your own research, are you?
Buying a Pearl with a 2 year contract should cost you around $200. You can do your own math. Currency calculation is available at
XE.com - The World's Favorite Currency and Foreign Exchange FX Site
Without a contract, I uderstand the price could be as high as $350.
XE.com - The World's Favorite Currency and Foreign Exchange FX Site for converting dollars to GBP.