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Hi guys and girls just wondering what a good static comp ratio would be for a RB25/30 turbo runnin 15-25 psi cheers

Hi all, I am currently in the middle of Building/Converting an RB30DET S14 Facelift and require some opinions from people with experience. I am aiming at a 400-450Hp (300-350KW) build, I am mid-way through and need some help deciding between a few items, I am not to stressed on the money side of things but prefur not to be paying out the ass for unnecessary items that dont give much power output. This is the build I have in mind and wondering if there are any things that people would change or would rate. RB30 block from VL auto Commedore (Honed and Dipped) Rb25DE head TopMount Manifold with 44MM wastegate 750-850cc Injectors Ultra Spark Coil packs Garret Turbo, either GT35R, TA3410 or GT3076. ( has anyone dealt with chinese rip-ops of these turbos and know if they are anywhere worth it? have been told not to bother but never heard of anyone having one blow up on them ) Have a crank collar, New water pump, Oil restricters etc I have a mate building this with me who is definately more switched on when it comes to RB's so ignore if I sound a little new to this. This is where i need help on deciding things. - I have read RB20DET gear boxes can only handle upto 400hp safely so i'm assuming a 25DET one will be needed? - Also I need help deciding on what internals to replace with aftermarket parts, am I right in saying cams would be a better investment than pistons/Conrods? -Should I replace the valves and valvesprings in the head as I read they are 400HP capable and would rather be safe than sorry. also does this make a power increase? -Are N1 Oil pumps worth it? there are very mixed feelings on these I have found, I am not going to be doing limiter raping skids or anything just after a nice sounding car with decent speed There is a place near where I live (Christchurch, New Zealand) that I have heard great things from when it comes to dyno tuning and have heard they provide there own ECU's so thats where I will be going at the end of my build. I am open to all suggestions so please feel free to post your builds and power outputs.