if you can't do without your car for a while, I'd recommend finding a ZC cam (yours is a SOHC ZC?) from a JDM importer, wrecker or local shop that deals with ZC engines a lot. Honda engine builders often have stock cams lying around. Anyway, if you can find one for a reasonable price this'll save you a lot of hassle.
As for the Exospeed cam(s), I've researched the D-series cam market very closely, used a variety of cams myself including Todas in my B-series engine, and I've just ordered a custom Y8 cam from Exospeed because I have a great deal of confidence in their products due to their experience and track record with D-series engines. These guys are true D-series experts, so they'll know how to make you a ZC cam that'll produce the kind of power gains you're looking for IMO.