So as a beginner, I have found a lbs that is greatness. I am going to ride some demos, but am looking for a bike I can grow with for under $1k. The 6 stretches what I want to spend, and the 5 is in my wheelhouse. The question is, is the difference worth upgrading from 6 to 5.....and then the same question from 5 to 4 knowing that its more than I want to spend. I don't want to buy a bike I won't want in a year, so willing to invest. Thanks for any feedback.