I want to start riding again, mainly weekend group rides or with friends. I had a Felt F65 a couple years ago before it was stolen. Now I am looking either new or old and price is a major factor. I started looking at new CAAD 10 105s, the LBS has it for $1500 otd. I'm also looking on CL and saw a few that I may be interested in. There is a 2006 Specialized Allez Elite w/105s that is asking $600, is that a fair price or too high?
Also in my situation, would it really be much of a difference if it had Shimano 2300s vs 105? My old bike had Ultegra, so I don't know how much of a difference I would feel.
Thank you for helping a newb.