I went out a short time ago and bought a Trek 3700. The guy in the shop had the 04 model and the 05 model in stock. I preferred the colour of the 04 so I bought it. It was also a little less expensive that the 05 model. He said they were basically the same but since I've come back and checked, I notice a few of the components have been changed or upgraded on the 05 model. Should I consider returning the 04 model for the 05, or are the differences minimal?