If I could only keep one bike, the trek or the roubaix - Id choose the roubaix everytime.
My shopping method was to buy the most expensive bike I could afford. Luckily I was shopping at tax return time - hence the roubaix. I think the cost of the bike has also kept me motivated - no ethical way for me to bury a $2500 bike in the garge and not use it - works for me