I would say for where you are at B's is jumping the gun. ALso I personally would avoid B's based on the timing belt issues. Get A's.

That being said $375 gets you a JDM header and $165 gets you the Carsound cat to go with it.

$300 gets you a VAFC.

Cam Gears - Toda $300 (I think), Skunk 2 $200 or less.

Tuning on the Dyno $125-$150 for an hour.