thats the shop i would recommend too, however being a shop, there is a probability of getting ripped lol. Since i've known the owner and the installer, its always better to have a reference who can help you.
If you dont have the knowladge, even if u go into mehran electronics, they will suggest you things like rockmars, chinese amps... but those guys do have the likes of brands like ss, hertz, jbl etc so its a shop to look for good stuff.