Yes, I have seen a few posts about this ABS Block going bad. Maybe you should hit up BMW NA and see what they can do for you. Might be covered partly or mostly, you don't know until you ask/cry to them.
There is a company over here that repairs these ABS Block ECU's. Their name is tachopix.de or Digital Tuning Service, in Hanover, Germany.
Here is the link (in English) to the e87 ABS Block. I am sure they can also repair e82's as well. Send them an email and ask.
http://www.tachopix.de/controlunit/n.../pagetype.iav/
They recently repaired the pixel failure on my old BMW e39 instrument panel. 155 euros for the repair. Took them less than half a day. With the next day mail over here my car was down three days start to finish!
Dack