AIO/ case fan recommendations

I have some subpar case fans and a 140mm AIO that I inherited from a buddy. But i think it’s time to upgrade, and start sprucing up the build.

Any recommendations on a 280/240mm AIO. I initially liked the H100i CAPELLIX XT. But it’s out of stock from what I am seeing. There’s a ton of different corsair AIOs to choose from and I was wondering what yall are running or what you favor- and what case fans could complement the AIO and 4000d case.