one other point to consider:

depending on your FD, the 46/36/26 combo can be problematic. Some mtb-style FD's want a 12t jump between the big and mid ring for awesome shifting. the answer, of course, is to get the XD cranks, try em out, and if the shifting is consistently from the butt no matter how hard you tune, replace the 46t with a 48t. it worked for me, and look at me now: I'm a total hero.

of course, if you're using a road triple FD, and with the atlantis, you probably would be, you won't have these embarassing problems. however, months later, someone with a mtn FD might be in a similar situation, and find this thread in a search. I want that someone to be covered!

over n out.
-rob