From what I heard around the forums, don't bother with HiBoost or the TBK kits because they have taken deposits a long time ago from some of the members and not delivered. F2 USA will be out with a kit shortly or so I am told.
I never heard of anyone who fit the Vivid Racing kit but it might be worth searching around to see if anyone installed it and is happy with the performance.
My turbo kit is from G-Reddy but is for the JDM Mazda 6 and not the USA version.