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It really depends what you are looking for - street, track; HP goals, daily vs fun, how much you are willing to invest ( I have two rebuilt N14 engines - pistons, rods, head, exhaust etc ... and your goals will determine the build, along with budget ! )
From your goals, I would lock in your CR and desired boost level. Not sure what trim you have, but if an S and stay with that turbo, you will have a lower boost ceiling ( i not sure what max optimal boost is for the S turbo - 16 psi ? ). If you go to the jcw or upgrade turbo ( ie airweks ) you can get to the 20s psi. You will need to upgrade your intercooler for this, as well as cat if it is an S. I'd stay with 2.25 exhaust for S and go to 2.5 if you push boost to the 20 range. You will get louder though - especially if you go catless.