well the upgrades on the campy sound about right for the price if there are other upgrades on the bike. Fulcrum 3 wheels are around $700+ . I agree with everyone test out the bikes first. then take it from there. Now If you're enjoying Campy a lot more than the Shimano go with the Chorus...just so you won't end up having those what ifs...
BTW what are the other upgrades on the bike ?