Tire Mounting

[NJkayaker]

I am in the process of getting new tires. Once I decide what to get I will get them from Tire Rack. My question is: where do I get them mounted? I can get them done at the mechanic who works on the Boxster (an independent Porsche guy) or at garage that works on our other cars. I assume the Porsche guy will cost more. But is there really going to be a difference in quality? The "regular" garage is a great guy who we trust and has a very good rep. Let me know what you guys think.

Thanks.