IMO you're better off replacing it. The A-pillar is a major structural support and I wouldn't want a car that had a damaged A-pillar. If it's not fixed perfectly, you could have a lot of issues with cracking windshields/roof glass and such.
I don't know your situation, or if you bought your M3P new, etc, but right now you can get an MSM M3P for $10 under the $55K rebate cap.