I plan on letting the LBS replace the crankset on my Cannondale mt. bike. The two outer rings are Coda alloy; the inner is Segino steel. Since the shop is not a Cannondale dealer, I don't know what brand of parts they stock. What brand/model and price crankset would be of a similiar quality to the ones on my bike? Are there any brands a reputable shop might stock I'd want to beware of? I have neither the tools or expertise to do the job myself.