If you are turbocharging the FRP, dont get uprated cams yet, unless they are specifically designed for a turbo. Cams made for an NA car may loose you power on a turbocharged car. Depending on other mods, on a turbocharged car, you would ideally want around 500 degrees duration between both the cams. So 250 degrees inlet and 250 exhaust would be good, 260 inlet with 240 exhaust could also also work well, but you dont really want to try and run with too much duration on the cams, it creates too much overlap, and you either loose some of your compression stroke, or some of the combustion stroke. It scavenges on an NA, so you can run with a really hot cam like a 290 degree duration if you wanted, but that would be abserlutely aweful in a turbo. You can go for higher lift, but try and keep the duration down if you can.
Dont just pick a cam because its higher lift or just for the duration, you really need to find out the head flow rate, then match the cams to it. The best type of cam for an NA or turbo is a cam that keeps the valve in its efficiency range the longest. So if your max efficiency lift was 9mm, youd probably use a 9.5mm cam, so it goes just past the max efficiency range, then instantly when closing, goes back through that efficiency range. Then the ramp is designed to elongate the time in the efficiency range. If you had a 12mm lift cam, you are wasting engine power, because it uses more energy to lift it that 2.5mm more, so you are adding more stress to the engine for no reason, so they will actually loose you power. Its more technical then that, but thats it in a nut shell, and that is the same in turbo or NA.
Its a common misconception that bigger fuel injectors give you more power. More fuel in the engine will loose you power, not increase it. If the standard injectors fuel fine past 200bhp, then changing them to bigger ones will not gain you anything, except if they are a very highly developed injector with a better spray pattern, but generally not.
Have you considered individual throttle bodies for your NA with nitrus? People have got around 200bhp with just those and mapping, with nitrus aswell, you wouldnt need much to get 250??
You have so many projects on the go, i dont know what you will come up with next!!
When you say you might fit ST200 calipers & discs, did you mean on the front or rear? I was looking for a potential upgrade for my rears, so if they fit, i might look into it, i think i have a set of rear calipers in my garage somewhere!