Why not get a B18C1, get a good race header, PWJDM whale penis intake, ITR/CTR cams and play with the C/R some with a thinner head gasket and have a professional tune done? B series all motor builds can be expensive just ask Jake or Mitch. Better off saving for boost or a H/K swap into a lighter chassis. Just keep it simple.
This. I just got done building my JDM B18C (SIR-G spec) with full Type R head internals, as well as Skunk2 Intake manifold (see my build thread).
Mine wasn't terribly expensive, but I got the hookup on a lot of parts. I got great deals on just about everything. The tune was the 2nd most expensive part about it, behind the Hondata s300.
If you intend to tear down and do a build, there is no sense in spending the extra $1000 on a Type-R unless you want the "glory factor" of having a real Type-R motor. But, then, if you intend to tear it down, it won't be much of a Type-R motor, anymore.
Just go with a full GS-R swap (Engine/Transmission/ECU). It is a significant performance improvement from the LS (around 30hp).
If you need help with anything, let me know.