Originally Posted by
mstateglfr
Given your arent competitive, an $1800 105 road bike that fits you well will be 97% of a $3000 road bile that fits you well.
I doubt the stock wheels on either bike are as grest as the known parts, which is why buyibg lower could be good since you can upgrade the wheels.
Gotta second this suggestion.
Disk brakes are the only thing that you can't easily upgrade as you ride.
Figure if you want disk or rim (I know you said you were leaning rim) and then look.
I doubt you will notice much difference in ride quality between a 105 drive train and Ultegra (not Di2) but you will notice the difference between stock wheels and a good mid-price ($1200-1500) set of wheel.
Make sure you get a good bottom bracket and good wheel hubs as that's where the friction is, so don't skimp there. If you are gonna spend money to upgrade specific components, look at the places with bearings first.