[Sirtel]

I don't particularly care what the spelling is (as long as it is correct, of course). In fact, I may not even notice if it's British, American, Australian, Canadian or whatever, aside from something extremely obvious like color/colour. I may find it weird if they use British spelling in an American thriller or American spelling in Harry Potter, but it doesn't overly bother me. BTW, I'm also a non-native speaker.

When there are both UK and US editions available to me, I usually just buy whichever is cheapest.