there's a reason, that the 8 series weren't made for very long. remember that the 850i was a close to $100K car when it was new and in 3 years, the same 850 could be had for mid 20's.
they are plain inreliable and overly exspensive to repair. especcially for the 850 with its 12 cylinder. beautiful cars but to replace the c70 with it and drive daily i think is askin' to be broke...or even more broke.

how about a early 2000's 5 series, one of the best platforms, bmw has ever made. get a 540i wagon in black...now thats pimp