Post larger photos of the damage. If it's just your rear bumper, it can be taken care of for much less than those quotes. If there is structural damage/bent sheet metal involved it will cost more. I would ask your local BMW CCA chapter where their favorite body shop is.
And yeah, I read probably 80+ pages of that M5board thread back when it was happening. Truly awful stuff.
Last edited by tock172; 11-30-2012 at 06:28 PM.