(Reasonable) Audio Shop in NY City Area?

[Parsnips]

Love my TDI, but the audio system isn't all that great. It's got the RCD510 radio, which is fine if and when they install the always-on iPod issue and the non-Dynaudio speakers

Anybody know of a reasonable (if that's possible) shop that could install new speakers and maybe a subwoofer in the NY City area? I'm not looking to spend more than a couple of hundred bucks (I'm not looking for a streetlight shaking system) and I'm not in the mood for taking on a challenge for myself.

Toeball's tutorial is amazing but way beyond my skill set...