My chimney's in danger of collapsing. 104 years of wear and tear I guess'll do that to a chimney. I have two options I'm looking at. Aluminum reinforcement or stainless steel reinforcement. Aluminum should be around $1300 and according to my contractor should last about 6 years given the chimney's condition. Stainless steel reinforcement, $2200, but according to the guy could keep it from collapsing for up to 20 years. Any advice? Take his word for it completely at face value, or keep searching for cheaper pastures.