I've had multiple years of Jettas and Golfs and can tell you that if you decide to get a rack, then a roof rack is the way to go. If you decide to get a roof rack, get a Thule rack (not Yakima) since Thule has a very specific model of foot mount for the VWs. For the older cars it was a Thule 305.

Roof racks are expensive though, and right now I just pop off both wheels and put one bike in the Golf trunk and one in the back seat. They're inside, safer, quieter and make no difference on gas mileage (which means nothing anyway....you have a VW after all). Only thing is....this is definitely not very "OCP-like"!