Can you compare your 540i (e39) to your 550i (e60) for me? What did you really like, what didn't you like. They are both cars that still feel analogue, and I could definitely see myself picking up one in the future as a DD.
Current: E92 M3 Sparkling Graphite/Bamboo Beige/6MT. E36 M3 Techno Violet/Dove/5MT. E85 Z4MR Alpine White/Imola Red/6MT