What don't you like about the Cross Check?
(I was going to recommend you look into Surly bikes as I read your post...)
Many of us have Surlys of various makes, or have test ridden them, or covet them, or know someone who has one, or are familiar with them in some way. If you can tell us what makes you feel the CC won't work for you for duathlons or centuries, that will give us a lot more info.