You can pick up a NEW Clifford for roughly the same price, depending on features. And x2 on the used wire harness, that's like 30 wires to either cut or extend...
New remotes are like $60+ and then you need materials to do the install or pay for the labor... not worth it IMO, unless it's a G4 or G5 or whatever Clifford's top-o-da-line model is these days.