Two stems in 15 years is not a bad track record, especially with no injuries? I say Nitto forged Technomic Deluxe. It's $50, and well worth it. I thought all stems flexed until I got one. With the height you run, it will be money well spent.,,,,BD

It's long, but not as long as it looks. On a 60cm framed bike I have, it can be dropped to the point of looking normal.

http://www.velo-orange.com/nitedest.html