well based on your handle gsrcrx, ill assume you are biased when it comes to the gsr head.
did you know that gsr IM made by after market companies cost more than any other b series IM? as far as cc's go, it doesnt matter. you want to pick up compression out of your head you can do a number of things; reseat your valves and have them sit deeper in the dome, add material to the quench area, or simply mill the head. itr heads are simply b16 castings that have been opened up just slightly more than their casting counterpart. what it all comes down to is swapability. if you have an ls head, b16 head, or itr head, you can swap IM across them all. the same can not be applied to the gsr head, which is why i call it a bastard, or red headed step child head.
as far as your cam comment goes, i think you should actually research that. a gsr cam is no different than a del sol, sir, or civic si cam. the best cam honda made was the ctr cam, intake. the ctr exhaust cam is identical to the 96 itr.
92civicb181b, bring me a stock crx si, and for $300 dollars i can assemble a turbo setup for that car. bring me any d series and i can bolt on a turbo assembly for $300.