If you were moving your entire household from the US to the UK, then I would say use a transformer, just making sure that you have one that will actually run your appliances. Little transformers don't work for big appliances, and big transformers are expensive. Again - if you have multiple appliances, and are bringing everything in a container (as we did), then it's more cost effective to buy one good transformer and use your US appliances.
BUT - for a new purchase, buy it here. Cost differences notwithstanding, the benefits far outweigh the cost.