And the surprise came yesterday...
MFactory LSD with 3.46 final drive. Bought it off a member who bought if off a member who purchased it new and had it assembled by MFactory. Apparently he totaled his car after putting 500 miles on it, and for the price I knew I couldn't say no. The ratio is significantly shorter than the stock 35i manual 3.07, but given that the tires I'll be running on the rear will be about 1.3" taller than stock, the net effect isnt far off from factory in each gear. Will still cruise around 3k at 80mph. Now to find details of install and decide if I'm going to be replacing anything else while I'm in there. Exhaust comes to mind, but quite decided on that yet.