You should get 190kw (255hp) atw, maybe more, depends on boost and tune.
The limitations will be the stock injectors, upgrade to 550cc or more to get around 210kw. but that will be at hi revs, no effect at mid range.
Yes the torque figures are more important than power for a street car. You should get about 390Nm peak.
For an easy to drive daily, consider the smaller size turbo GTPS01 to get similar torque, lower power, but the torque will be at lower rpm.
The PW TMIC is good but if you can get a STI one cheaper that would be the choice.