I've only been to Forged once and they were closed. So, I cannot really speak on their price and service.
As for Z1 it's a great place to take your car. All of the guys there are passionate about what they. Take the time to assist you with what you want and inform you about what is best for your car. They allow you to be in the shop and see the work that they're doing in your car, which to me is important anyway. As far as pricing, they have the best prices of any place that I've been.
As John stated earlier, to just take the words of the people on this forum. Go to the different shops and evaluate them for yourself. At the end of your evaluation go with whomever you trust.
Good luck!
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