Pardon my brevity, as I am replying from my phone.
Ok, so you want to make more power, and now you have a basically an si setup. You have 3 best case options. Minime, motor swap, or turbo. For some reason you at no turbo. Ok. It looks like you are set on a b18, that's good, I prefer that motor to a b16 even. To be honest though, I would build a single cam with the money you be putting into a b18 swap. Once we get toms car setup it'll run with the b16/b18ab swaps for a fraction of the cost.
Soo many options, the way I see it, the d16 and b18 are great turbo platforms, the minime is the cost effective all motor option, and the b18c is the first swap you should conside if you are dead set on all motor.
Check my signature, and guess which car is faster...