Need a market check - Bentley Turbo R

The 88 to 94 cars aren't too tough to diagnose or service, in 95 they went to an OBD2 system so you will need a basic code scanner . Overall the TurboR cars are not much trouble if used constantly.Working on the cars is no big deal, not many special tools needed for basic maintenance. Most common items will be brake vaccum system, leaking suspension spheres,and iginition key switches and power seat brain units. The rest of the car is all steel and iron. Even the turbo system is bullittproof. The parts are costly but overall very tough and will last. Be cautious of a car with bad wood or broken power seats,both VERY expensive fixes.
The Arnage is a different animal. Much easier to drive but a real German feel. Tighter steering and much more feel of the road. The BMW stuff is easy to repair but you do need their dedicated scanner and many hard to get ($$$) special tools for anything beyond basic fluid or brake services. That being said the Arnage is put together like a Bimmer so the quality of the finish is much higher.
The comparison of a Turbo R and an Anarge is like a 308 to a 360. The 308 drives like you imagine a Ferrari to drive. Fun ,loud,and a bit rough around the edges. The Arnage is a bit more like the 360,tighter,smoother,maybe less fun, and a better build quality.But you can work on a 308 in your driveway or local mechanic relatively easily. The 360 (Arnage) is your ticket to being married to the dealer for major stuff