Any bike with a mix of Campy and Shimano is a hodge podge and does not have all original parts. With that out of the way, does it have STI/Ergo, or downtube shifters? If the former, the bike is probably in the $300-400 range to me. If the latter, no more than $200, unless there is some vintage collector's value on the particular model (but then again, it's not all stock).