I have the same car. Thankfully, the sport button stiffens the sway bars and not the shocks, so nothing too special about them. there are quite a few different brands out there to choose from too.
If you go Bilstein, I think we take the Heavy Duty. There's a Touring and Sport option as well, the touring will soften up the ride more than you're used to. I think the Sport option is even harder riding than stock. I was looking for mine, but it's been a few years. So far, no need to replace them.
FCP Euro has a lifetime warranty on all of their parts. Including wearable items! That's where I usually get most of my parts if I have time to wait for shipping.
https://www.fcpeuro.com/BMW-parts/53...5&b=5&d=788&v=