I was thinking into another e34...for all that is holy, not into an e30 or e36!
My first thought was to upgrade a plainer e34. But then I got to thinking...this would rule the earth in a 6-series chassis. It'd require a good bit of work, but what e24 doesn't? Or how about a 6-speed E31? Maybe a one-off 750iLM? How many near worthless M70s are out there with bad slushboxes?