Quote Originally Posted by cusepack
So, will I really notice the component upgrades from the 1000 to the 2100?
Based, on your pst experience and desire to start riding a road bike again, yes. There is a significant difference between the weight and performance of Tiagra, Sora and 105 components. You're also getting into better wheelsets. All this pays out how the bike brakes and rides. The frames are also significantly different. Since you are willing to spend the money, I'd narrow at least to the two 105 equipped bikes and choose based on how the bike fits and how it rides thinking long term. How far do you expect to ride and what type of pavement? See if you can test ride each bike in typical terrain so you can feel the difference. One may absorbs roughness better and one may be a better climber/descender, etc.