I am a newbie to the sport and really know nothing at all about cycling. I recently completed my first duathlon on a borrowed bike. The bike was too small, but my only option to see if this was a sport I wanted to invest in. I realize I really do enjoy cycling and want to buy a bike of my own. I am on a limited budget and have found two bikes.
1. 2009 Cannondale CAAD 6 with a full Tiagra package for $950.
2. 2009 Trek 2.1 with Tiagra shifters and 105 rear derailleur for $1050.
These two bikes are located at two different local bike stores. I rode both and both seem comfortable to me, therefore I am at the point where I'd like some advice. I plan to do more duathlons and possibly move into some sprint triathlons. I also plan to do plenty of rides in the 20-30 mile range with some longer. Which would be the better bike to get that I won't outgrow quickly? Also, I am 6'2" and 215lbs. Thanks for any help you can offer.