What sector size to use in ntfs format?

When I formatted an NTFS partition it gave a list of sector sizes to use. I selected default, since I didn't know which one to choose.

Which size should I use, and what did I get with "default"?

http://support.microsoft.com/default...;EN-US;q314878

and

http://support.microsoft.com/default...100108&sd=tech

Hope it helps.