pete75 wrote:The easiest way to get the touring bike you want is buy the frame you like, buy the components you want on it and build it. That way you get exactly what you require. There's no earthly reason why, for example, all the drive train components should be from the same manufacturer.
If you're not an expert and don't have access to expert advice then buying a set that's known to work together is a sensible way of reducing the risk of incompatibility.
Jonathan