Not sure if I got tired of waiting for the right one to come along, or if I just got sick of driving the POS e34, but I finally bought a TI.
Isn't white or a slicktop, but is a manual and has black interior, so close enough. Allegedly a California car, but had Texas plates on it. High-mileage, has one bad rust spot in the usual location, but the undercarriage looks really clean. Seats are garbage and it needs rear subframe bushings, but otherwise pretty clean (not counting the dog hair...).