As the title really.
If you've got one FSA do a headset that fits
http://www.bicycleheadsets.com/
What is the question?
Is it a headtube that you are looking for, to make a frame?
Or a headset to fit into a frame with a Campagnolo style headtube?
Campy=Campag unless you are a Septic..... :-/
Would the OP care to rephrase the title into a meaningful question perhaps?
Or should I just start a thread with a random phrase in it too?
If the question is "Is a campy style integrated headtube any good?" then my answer is unequivocally yes. Fitting a headset is a tool free doddle and eventual bearing replacement will be dead easy.
If the question is "Where do I find a headset?" then you're looking for an Integrated and not Integral jobbie. Hope do them amongst others.
Does that help?
If the question is "will it creak?" then that answer is "probably.."