As has happened with other series of cars, such as Audi S4s, there are currently several generations of BMW M5s that are converging on value, leaving you with some hard decisions as to which you’d prefer. Indeed, from their start through the E60 M5, the sports sedan got larger and heavier, but gained 2 cylinders per generation and corresponding power levels. The E34 BMW M5 was a refinement and softening of the E28 original design but kept the race-bred S38 inline-6. Purists eyebrows raised when the new E39 M5 launched with a 5 liter V8, but the 400 horsepower soundtrack has subsequently has become a serious legend and fan favorite. Purists once again held their breath as the E60 M5 launched, now with a 5 liter V10 – a high revving, howling banshee of a motor. All of them are serious forms of motivation, and the value of the first 4 generations are all coming into line. While I wasn’t able to find a good example of an E28 M5 for this writeup, I have the subsequent three generations to check out – which would you choose?