Which bike do you think is the better option (I ride 4 days a week, 60-90 minutes at a time, maybe a 2hr ride one day). Perhaps a metric century once or twice a year.

bike 1:
Brand new 2010 Specialized Allez Comp with Shimano 105 components. Aluminum frame with carbon fork and seat post. $1300 (tax included in that price)

or

bike 2:
2007 Specialized Roubaix full carbon frame. Only has 230 miles on it. Shimano 105 components. $1500.

This is pretty much a hypothetical question as I can't really afford a bike, but just in case I happen to come into money in the next two weeks, I want to be prepared.