I have found some definite answers. Summary is : none of them will get warranty in usa but needs to be shipped to UK/Europe.
I was planning to buy one handset but holding back due to the lack of warranty.
However if someone has got other info please add it here
1. Handtech : I sent a mail and this is the reply that i got.
If you needed to claim on the warranty for the Galaxy II then it would more than likely have to come back to us I'm afraid as it is only covered by a UK warranty. However, sometimes Samsung in Europe will help but we obviously cannot guarantee this as it would be their decision.
2. Expansys-usa - Talked over the phone -
Told me they will help me ship the phone to UK. But i dont know how fast that is going to be.
Hope this someone here