Join Date: Jun 2005
Location: Silver Spring, MD (MABRA/MAC)
Bikes: Cannondale Cyclocross, Specialized Langster, Giant TCR-C2 Composite
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CX bikes, in all reality, are more a derivative of raod bikes instead of MTBs, even though MTB technology in the past ten years has revolutionized cycling technology in general.
With a CX bike, the gearing not very different from that of a road bike. The gearing will be a bit lower, but the range of gears will be the same, if not, less than that of a road bike. With that in mind, short cage derailleurs and derailleurs for double cranks (or used as "chain guides" on single cranks) are the norm.
Dura-Ace will work just fine, especially the used setup you've described below. Just remember, as has been mentioned already, that components on a CX tend to take more of a beating than on the road. Otherwise, $330 bucks for everything you listed? Hell, go for it and have fun.