So....
I drove the M3W again today for a longer period of time, about 40 minutes. I do think that a fair amount of my initial misgivings were due to my unfamiliarity with the car. On the longer drive, I learned to really baby the clutch, and that really allowed the drivetrain to settle down and gain a fair amount of composure. I think my earlier reports posted above were much more due to driver error/inexperience than anything else. That turn radius is a bit of a bitch though...isn't it!
The bug has bitten hard...I think I'm hooked. Now that Paul has reminded me that the car probably has a fair amount of value on the used market

, my last qualm has fallen.
Many thanks to all TMers for their advice.
Cheers!