Join Date: Jan 2008
Location: Beaverton, OR
Bikes: Kona Jake, Kona Jake the Snake, Kona Major Jake, Kona Kula, Ridley Excalibur, LeMond Buenos Aires, Pinarello Gran Turismo, Pinarello Montello, Trek 614, Austro-Daimler Team, Motobecane Grand Record, Schwinn Voyageur, Nishiki Olympic, Steyr Clubman
Mentioned: 36 Post(s)
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Quoted: 518 Post(s)
Definitely, use the Diamondback. Anything you get cheap will be heavy, but your fitness and handling skills will have a much bigger impact on how you do. Use the MTB for now, and when you start moving up in the standings, then you can drop some change on a good CX bike. No sense spending money now on something else that you'd want to replace anyway.
If it's got a rigid fork and a relatively flat top tube you're golden. If not, that's OK too. Also, I wouldn't worry too much about CX specific tires unless the courses in your area are very flat and fast.