^^ Maybe I missed something big, but isn't Dura Ace a product line of Shimano's? Therefore only Shimano makes Dura Ace? And yeah, I know for certain that there are 3/32" Dura Ace cogs.
ElSetho, you will want all the components in your drivetrain to match width, but you can mix and match most sizes, except for a 3/32" chain on a 1/8" cog or chainring. Oh yeah, and most people call them chainrings rather than cranks, which are the long things your pedals attach to. The confusion probably comes from the the fact that road cranks are often sold with chainrings attached, called cranksets.