W124 strut life expectancy? Replace while I'm in there or no?

[BodhiBenz1987]

I know it's never going to be the same number from car to car, but i could use some thoughts on this ...
I discovered some bad rust on one of my upper spring perches, and need to repair that. I decided to do as much as I can while I have the springs out, since taking those out has been a looming fear of mine for years and I don't really want to have to relive the stress anymore than I have to.
The ball joints and LCA bushings, as well as the strut mounts and bumpers, have about 125,000 miles on them, and almost 15 years, so I decided to replace all those things. I think the springs are original and I am replacing them as well (one has a break at the bottom).
The struts themselves (for some reason not the mounts, bumpers or plastic covers), however, were replaced 50,000 miles and 6 years ago by a shop, and I'm torn on whether to replace those. They are Bilsteins. Neither leak and the ride feels great, though one has made an odd creaking sound when the wheels are off the ground the and steering wheel turned (it's the same wheel that was hit in an accident, so I've wondered if this was related). Still, haven't had any performance effects. I hate to be wasteful, since they aren't cheap, but I'd also hate to have to replace them in 10,000 miles, given that I'm not real keen on dealing with the springs again. I'm thinking I can put them back in and reasonably hope for another 40-50K ... does that sound realistic?