With stock b18c motor I got a 7 whp gain with skunk2 pro 1, I think you have to share with us the compression of your motor, but I t hink that you'll see a lot of gains with a good tune and with a 12.0+ compression.
Go with stage 2 tuner series cams the pro2's are designed for a engine with internal work to raise engine compression. Should see about 10-20bhp increase with the tuner series stage 2 cams mapped and depending on condition of engine.
Pro Stage 2's on a standard bottom end will give you an increase in mid-range but not top-end, you need to raise compression to get the same rise at the top-end. This is what I found on a standard B16b bottom end, I'm unsure if there is much of CR difference between ITR & CTR bottom ends.
Go with stage 2 tuner series cams the pro2's are designed for a engine with internal work to raise engine compression. Should see about 10-20bhp increase with the tuner series stage 2 cams mapped and depending on condition of engine.