95 fiesta si

Iam considering a zetec turbo converion for my Fes and wondered if anyone could recommend a reputable company that could do it for me. I dont want a cowboy company thats gonna charge a wedge and do a shitty job, looking for a company that has experience in these sort of things. Currently the cars a 2.0 Zetec with kent cams, 4-2-1 racing manifold etc, pushing about 160BHP, was hoping for around the 200BHP after conversion. Has anyone got any guesses as to the price of the conversions and BHP figures ?