As with any internet purchase, there's always a risk if you don't know the seller but it's no different from buying from a UK seller. I've bought things from across the globe and the only ones who didn't deliver were from the UK!
Off the top of my head, you'll have to pay 4% duty + 15% vat + handling fee so add about 20% to US prices. Watch the postal cost as well as insured post can be expensive.
I read somewhere that the pound is expected to weaken again from next month and vat is going up to 17.5% on 1/1/10 so bear this in mind.
Good luck finding your bargain!
_________________

For more information on identifying Breitling replicas, please visit my web site
http://f4buz.com/watches/breitling/fakes/fakes.html