ITR LSD is fine up to 300whp if the driver isn't an idiot.

you can find them for 350-400 on honda-tech all day...which makes the ITR LSD the best bet in my opinion...just remember the ITR lsd doesn't work with cable tranmissions (with the 92-93 gsr transmission being an exception) and it doesn't fit into a b16a transmission...ie y21 or s4c...so basically you are left with putting an ITR lsd into a gsr/R/LS transmission.