MichaelB wrote:The other thing, is that i already have a bike with 9sp Shimano, so to have a twin for emergency spare will be good.
That's actually the biggest reason for putting Campy gear on it. You are someone who is going to be playing with sports bikes for some time (not about to 'retire' like some of us old pharts). If you can get Campy at a good price, put it on the Cinelli, ride both bikes (as you will anyway) and discover which one you prefer. In either case, the groupset can be removed and flogged off if you decide you don't like it.
Remember, in a few thousand kms, you'll be buying yourself a fancy, expensive bike ... and you'll be faced with this same question again. Better to get it answered now.
Spare parts? Just ride the other bike.