Trickraca

I have tried searching but cannot find the right answer i am looking for. i have a 2008 evo x gsr with the following mods.

perrin turboback exhaust
UICP and LICP
OBX radiator hoses
HKS SSQBOV
INJEN SRI
ACT full face Heavy duty clutch kit
Accessport
Currently on a stage 2+INJ accessport map

My question is this, what would a good parts list to start looking at BEFORE i get a bigger turbo. I was told that the car as is will be around 370hp and i am assuming thats at the crank not the wheels. If my goal is to be in the mid to high 400 hp range, what would be the best route to take? i plan on getting a fp black or something around that power range as i am looking for top end power not so much off the line power. i would like to build the powerband as a whole but the top end will be my focus. I know i will need a bigger turbo as well as injectors and fuel pump. Should i look into a certain type or brand of cams and exhaust mani? im new to the Evo game as i used to have a wrx and a mazdaspeed 3. Any and all help would be appreciated. Finally, what would be the average hp to the wheels if i were to upgrade just the cams, exhaust mani, and FMIC? ive read that just a FMIC wont net any additional gains but i have seen vendors claim a 20hp increase. i would like clarification on that.
thanks in advance.

evo3429

Should look into upgraded FMIC, Fuel pump, injectors to start.

Trickraca

would a 255 pump and 1000cc injectors be plenty for the fuel system upgrades? id like to do all i can minus cracking open the block so i know my power is limited to the stock block

08GsrX

Pretty sure that fuel pump would be close to maxed out if your pushing alot of air through an FP Black.

Trickraca

Which turbo is safe to use on the stock block with cams,mani,fmic,injectors,pump? I see alot of tunes that are dialed back due to too much torque.