this is the advice i gave someone on HT, he had a 00 SI so keeep that in mind:

On a b16 id just go with a Short ram AEM, its really not going to make that big of a difference on what you are trying to do. Comptech Ice Box is nice too from what i have seen.

Tri-y header is a good choice if you are on a budget for sure.

After that i would look at a Skunk2 Stage 1 (NOT PRO 1) Camshaft upgrade or a Buddy Club 3+. I prefer the skunk2 cams though. THey are slightly more aggressive than the ITR cams .

After that i would purchase a Skunk2 PRO Intake manifold.

After that i would purchase a VAFC if you want to keep your car OBD2, or a Crome Pro ECU and conversion harness if you are ok with converting to OBD1. TUNE TUNE TUNE

should pick up a good 10-15whp no problem.

other than that i wouldnt do much more mods as the b16 just doesnt make the power unless you go inside the motor. I would maybe do a light flywheel and thats it.

good luck
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$5000 on the head is rediculous, there is no need for that and you will be very dissappointed.

what i would do is this and in this order

1) SKunk2 Stage 1s or BC3+ (no need to change the valve train)
2) RMF Replica header or Hytech replica header (i sell both)
3) Skunk2 Intake manifold
4) Crome Pro ECU (i sell it)
5) Tune TUne Tune

other than that its not worth doing much more as the B16 just lacks tq. if you want to do something more id suggest starting with a GSR