Coinbase also operate outside of the US as a payment processor, I have seen them on a UK site and made payment. I think it is down to Dell and not a restriction by the payment processor.
Thats what I am trying to say in my above post. Since Dell has a made a first major step to accept bitcoin, why not making another major step, the biggest one to me, to add a few persons as their staff to keep dealing with international orders via Bitcoin. No question asked, bitcoin sent, and the datas where to ship the item and they to ship to there. I wonder which will be the first major company to do this, am hoping to see this happening soon.