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Go to West End in Gardena. That's where I got mine done, and back when I had my 335i, I went there too. Everyone that I know go there. Chris and Darren do not use a digital alignment system, they literally get it done by using the old school measuring tools, so you know you're getting the most accurate alignment to whatever driving characteristics you need.
If you know anyone who does track days or does autocross ask them for recommendations.
The guys that work there all track and autocross. So they all know what they're doing and they literally ask you what your driving style is, so really tailor to your needs.