Thanks Docnick. I did call back an speak to the mechanic about discussion I found indicating that this type of noise more likely signaled the need to replace the tensioner and clean out any clogged chain oil valves (around 100K) rather than replace the chain, because (as my mechanic agreed) the chain will likely outlast the car. In response though, my mechanic repeated that he knows I?ve taken good care of the car otherwise (i.e. regularly changed the oil). So I should still NOT worry about it until it gets noticeably loud.
In my on-line search I also gathered that this type of repair on a Saturn S series would run closer to $500, but a broken chain would possibly cause $1500-2500 worth of damage.
So I still have a dilemma, trust my seemingly candid mechanic and save my wallet, or trust my gut and potentially save my car.
Any other thoughts? Anyone else care to weigh in?