From what I've seen, the Sugino XD crank comes in a number of different configurations: 24-36-46, 26-36-46, 26-36-48, and 24-36-48. What I would prefer is 24-34-46, but the replacement chainrings are not ramped and pinned like the originals. Not sure how much difference this would make in shifting performance.
http://www.rivendellbicycles.com/web...ngs/12067.html
http://www.lickbike.com/productpage....=%270043-70%27
http://www.bicycleclassics.com/cranks.html
http://store.somafab.com/suxd600cr.html
http://www.yellowjersey.org/cranx2.html