with all the gadget that you already have, there are plenty of options for you. B18B's are strong engine and i'm sure you're aware that these engines are low compression. i've seen people push 12psi on those bad boys all day on stock engine. however, i do not like to give you bad advice based on other people's risk.
i say boost 8-10 using:
-12:1 FMU
-255lph
-440cc
-SAFC tuned
-missing link
OR
-SAFC (hacked with -35 trim, check out
www.dropshop.com tech)
-440cc injectors
-255lph
obviously, both above suggestions are intercooled.
Dr Drew has a lot of experience with B18's. he'll put in his 2 cents once he reads this post. peace