How light are the different models of the Six 13 and what differs in the models of the six 13. Im looking for one in a 52cm or 54cm. Anyone have any problems with Cannondale's Six 13?

Yo,

The main difference is the parts spec- the frames are the same.

The Six13's have gotten nice reviews indeed, the only issue to me is that they cost $500-600 more then the same spec on a CAAD7-8 frame which ride pretty nice.

However, Cannondale does have a few Campy equipped models, which is quite nice.

Honestly, at your age I would suggest looking at a R700 or R900 instead, and saving the rest of the money for coaching, race fees, equipment ect.