LeadingEdge

I have an A4 on order with the stock Symphony stereo, and I will probably want to upgrade speakers and amp (keeping the stock head unit). Anyone know of an audio shop in the Pittsburgh area with experience with Audis? Or short of that, just a good audio shop in general? I am new to car stereo upgrades, and I know to avoid the chains like Best Buy (plus I want better equipment), but beyond that I don't know where to go. Thanks.