Ok, I will bite...why sell a Caad-10 so that you can buy a new Caad-10? Why not just upgrade the one you have? If you are going to upgrade, then upgrade. Don't sell one bike at a discount because it is used so that you can buy the same bike at a premium price. That is not an upgrade, that is spending money to have something new. I would start with figuring out what it is about your existing bike that you don't like and think needs to be upgraded. From there, figure out if it is more cost effective to buy a whole new bike to get what you are looking for or if you would be better off just upgrading the group or components. Believe me, once you buy a house, you will find PLENTY of things to spend money on...