Bike noob question here: is it worth $600 to go from Shimano Sora components to 105s and $300 from Sora to Tiagra? As a noob, am I going to notice the difference or appreciate the upgrade? I don't plan on ever racing and will only use it about 4-5x/week.
I'd like to get a cyclocross bike and have my heart pretty much set on the Norco Threshold. Jut need to decide on which model.
http://www.norco.com/bikes/road/cycl.../threshold-a1/
Thanks.