If I had a CF bike I'd probably buy a very expensive torque wrench or those fixed torque key things. As I don't have a Nashbar low torque wrench (clicker type) and a large Tekton Torque Wrench for tightening my crank/cassette. I got along for years without torque wrenches, so didn't feel the need to spend a huge amount on them when I decided to get a few!