Saturn Repair Problems? Ask a Mechanic for Answers ASAP
A broken timing chain is unusual- they use a chain so that it lasts longer than a timing belt, usually the life of the vehicle.
If for some reason it really has broken, it is very likely that the valves have been damaged. Most Saturns will bend valves if the chain is even a tiny amount out of alignment, and if it broke, it is definitely out of alignment now. The fact that you are getting noise while cranking I would say that you definitely have bent valves.
As far as whether it is worth it to change the chain- I would say no. You would probably have to change the head/ or at least all of the valves, and maybe even a piston or two if they were badly marred from the valves. It would be cheaper and last longer if you replace the entire engine with a used or re-manufactured engine.
Most mechanics should be able to tell if the valves are bent once they pull the valve cover, but then again the damage could be small and hard to see without pulling the head.