I'm thinking of switching to a steel frame road bike and I am toying with the idea of simply buying a frame and moving all the components and wheel-set over from my current road bike as an alternative to buying a new complete bike. Through work I can get a deal on Soma frames and I like the looks of the Soma Smoothie ES. My current road bike is a Giant Defy 1 (circa 2009). My question is if I did purchase the Soma Smoothie ES how much of my Giant Defy could simply be swapped over to the new frame and what would I need to purchase new? I have a fair amount of bicycle wrenching experience but I have never done anything like this. Again, I am looking at this frame swap as a way to save money so if I am going to need to purchase a bunch of new parts I will instead look at buying a complete or just resist the urge to ride something new haha.