Less than you think ... probably, between $400-and-$600 if you were selling it as a group.
The price would depend on the actual cosmetic condition [a vague estimation of use can be made from the amount of wear on the chainrings (unless they were replaced) & of some of the other components] & crankarm length & presuming the hubs were not included (since they would be attached to the wheels!) AND the motivation of the buyer.