What is the typographic right way to write the ellipsis in the Sigur Rós album; "Takk…"?

I’m a perfectionist. I’m adding this Sigur Rósós album Takk… to iTunes and I can’t decide wether to use the U+2026 Horizontal Ellipsis or to use three periods. I’ve noticed that Wikipedia, last.fm and Sigur Rós themselves uses three periods. Still I can’t help but think that this is just a typographic error and that the right spelling is Takk… How would you write it?

FYI, fluther automatically converts three periods to an ellipsis. Just so that doesn’t become a confusing element in discussing this :)