do you know the stack height of your current headset? i assume that as long as the ck doesn't surpass your current setup by too much you should be fine. you can go to the ck website and they should list the upper/lower/total stack height of their hs, as well as many other manufacturer's sites.

fyi, i checked around at different threadless headset manufacturer's sites before i bought mine for who made some with the lowest stack heights, and the lowest i found were certain models of cane creek, fsa, and the campy record/chorus. also that star headset that eai offers seems to be super low profile too.