I had the same thought a few weeks back. Possibly, a 730 for the 300SE I currently drive.
What make me stick to the 300SE over the 730 was simple : the 126 was timeless. It has seen 2 other models climbing over its head, and whereas put another model over the 730 and you would look a little out of place with the newer Bimmers on the road. Somehow, I find Bimmers running out of style and fashion the minute a newer design is introduced. Bias perhaps.
So, in 5 years time I can still look at the 126 with much admiration than I would a Bimmer.
Or so I hope.
126 tailed by a 203, 129 leading the pack.