I find the 124 body car dull. A mint 6.9? How often do you see one of those???
I have owned a 116 300SD, and currently have a 400E. The 116 car was more fun and that was with a DIESEL. Note - I dont have to go fast to have fun!
By the way - you mention you have 2 126 cars, what is the reason for holding onto them over the 6.9?