What other motorcycle manufacturer offers the same level of diversity in engine configurations, suspension, and model range that BMW offers?
The boxer, various in-line 4's, parallel twins, & single cylinder motors are also found among Telelever, Duolever, Paralever, and telescopic front suspension systems. These are then constructed into models that range from road race-ready liter sportbikes to enduro racing. Impressive engineering prowess.
A nostalgic model added to the line-up using the awesome boxer-twin would complete the range. Accessorize the hell out of it with a sidecar rig, bags, trailer, etc.