I know plenty of M folks who go Mark's and their job is top notch. My buddy's E92 got in a rear end collision and they made it look as good as new. They are very well reviewed in the area with a lifetime guarantee.
Don't think twice..go to Mark's.
2011 Alpine White/Fox Red E90 M3. Sunroof Delete/DCT/No power seats/Square Apex ARC8s+ PSS /ACM Exhaust Mod+ EAS Tips