I'm still new to all this and I'm trying to decide what bike to buy. I don't race, but I do like to group ride. I'm trying to figure out if I should get 105 or ultegra components. I'm looking at a 2013 bianchi IMPULSO ultegra and the 2013 Scott speedster 20 with 105s the bianchi is $400 more then the Scott. Is it worth the $400 extra for the riding I do?