You need change nothing.
You were fortunate to snag a 3070.
It is a perfect fit for a 10700K.
Your case supports tall air coolers, and the NH-D15 is one of the best. It has fully the equivalent cooling capacity of a 240 aio. You need no more.
I do not like an aio in a full sized case unless you have a hotter processor and are looking for max overclocks.
The noctua will be easier to mount, be quieter, more reliable, cool equally well, include excellent paste(no value for kryonaut),
and... it will never leak.
The NH-D15s is equally good, and both come in black if that is an issue.
I like 140mm front intake fans.
They move a lot of air at lower rpm.
Noctua NF-P14s fans come in various rpm categories.
I would pick 1200 rpm.
If you want, you could go stronger and plan on running at reduced speed.
https://www.newegg.com/noctua-nf-p14s-redux-1200-pwm/p/N82E16835608064?&quicklink=true
Cases are a personal thing. Buy a case with the looks you love.
I like the Meshify C.
Another case I like is the lian li lancool II mesh.
Here is a review:
https://www.tomshardware.com/reviews/lian-li-lancool-ii-mesh-performance-review
PSU is excellent.
I have no opinion on Z490 based motherboards.