I ride a 2000 Buenos Aires and I love it. It's the full 853 frame with carbon fork. It rides so smooth. I don't know that there's a huge advantage to having a carbon/steel frame. It seems to be that steel is forgiving enough on its own. The carbon/steel is probably lighter, but the nicer parts on the Zurich might balance it out. If I were in a similar situation, I think I'd pick the Zurich for a few reasons: 1) It's all steel and it's good steel. Nothing compares to the classic ride of a nice all steel frame and I personally think everyone's first road bike should be steel. 2) The wheels are better. Better wheels make a better ride, plain and simple. 3) Better parts. I can tell the difference between 105 and Ultegra. I think it's bigger than Ultegra to Dura-Ace. The fork is better too.