I picked up a 1991 Bottecchia that my brother built when he was into this obsession of ours, using Dura Ace components. I have the opportunity to obtain a 2003 cannondale cadd 5 in mint condition with Dura Ace components. In addition I am contemplating a new bike with 2010 Dura Ace components. My question is, are there discernible differences between the three? Since I am new to biking, I am still feeling my way around the components. any info would be appreciated.