It turns out Quaife has some pretty smoking deals on their LSD's right now. I heard about this through the 9-5 forum (all Saab LSD's have sold out already), but I know you guys have some other cars, so perhaps one of you would be interested in this deal as well.
Brian, they have differentials for E36 328i's as well, though I know you already have an LSD. There are also diffs for cars from Mustangs to Ladas, so if one fits your car, I highly encourage you to replace yours! These differentials are race designed and BULLETPROOF. I would have installed one in my car, unfortunately they are for manual gearboxes only

http://www.quaife.co.uk/GEARBOX-SPECIAL ... rentPage/1
There are also close ratio gearsets for motorbikes in there (Honda Fireblade, Yamaha R1 and 600cc)