http://www.sram.com/en/truvativ/road...gxp/triple.php
That is the exact crankset as you have on there now (no head ache swap) . Truvativ makes Bontrager cranks.
Then you don't have to worry about incompatibility.
Dura Ace octalink is old stuff (new DA 7800 is like the Truvativ, but costs $350-$400). This crankset is better (more modern) and it doesn't clash with your Campy.
If you want the Truvative triple with the 39T ring then by all means proceed, but they make a 42T version too.