where exactly are you, I could refer you to a great indy near me, they never break the bank and I trust them exclusively with my m3. I DIY almost everything I can, but when I run out of patience, or time, I bring it to them. I never even ask for an estimate because I know they'll do me right. I always get parts at cost, and labor at real time, not book time!
But NJ/NY is kind of a broad area...
2002 Carbon Black ///M3 - current
2002 Stahlgrau ///M3 - RIP
2001 325i - sold