Shopping for a used road bike to get in to the game and came across one that seems to be a pretty good deal. Felt 55 carbon road bike. Dura-ace shifters, new easton tires and new chain. My only concern is it still has the original components, and has 20k miles on it? Don't want to buy it if I'm going to have to drop $100's in new components shortly after I buy it. Thoughts without seeing or riding it? Asking price was $600 w/ clipless pedals.