I think i'm going for this DESIGNARE one,..
My I7 8700 will fit perfectly thanks to the 1151 platform, i still have a lot of room if i need to upgrade it in the future (up to an I9 -9900KS, i'm super safe, lool).
As i'm working in a home studio, where the room is acousticaly traited and isolated, i might will delidding the CPU and put some liquid metal.
Then mouting something like a Heligon HE02 or a DEEPCOOL Lucifer K2 Gamer Storm, in the case i upgrade to a much stronger CPU later (though i'm a litlle afraid that my RAM will not ruin this, i have to check). Desactivating the case fans and GPU fans when it's not needed for less dB.
I will put my two 980ti, stock fans, in SLI, simple and clean, they never let me down. Displayed on my current Lenovo G34w-10, a 2K wide curved screen for my mixing tracks, really conveniant, + a 28 inch full HD LG (wich i might ending to sold).
Waiting for the 3080 annoucement to see if it's deserves the cost...
The 4x4go G.Skill Ram in dual channel, that's enough of ram and speed for my usage. I'm not going to change them unless i'm always at 100% usage. As i said, i'm just a little affraid if it's not going to bother the super huge CPU heatsink.
I will add an Intel Optane in the first M2 slot for the Os and my main softwares (like Unreal Engine, Autocad, Fruity Loops/Reason and Pro Tools) wich is super conveniant to manage all of the I/Os like midi peripherals, bluetooth etc because i have some blue screens currently when i'm using too much peripherals at the same time. Then my current 500go M2 nvme ssd will go in the other M2 Slot. with that, my 1To SATA SSD + my 5 hard drives in the rest of the sata ports for data and redundancy.
I'm thnking to add an AIC in the third pciex16 slot, but i'm affraid that it's not going to be usefull and it's cost a lot for a minimal improvement.
The Apollo 8p will go right into an adaptateur tunderbolt 3 to type-C, then it goes in one of the two thunderbolt ports, daisy chained with the two UAD-2 Satellites, and i still have one another TB port for... I don't know but it's very cool.
All of this in a most compact ATX case possible who can contain the huge CPU heatsink and the GPUs, with a front facing USB-C panel.
Tell me if something is wrong in anything i listed or improvement that will help me in the longer term, i really don't wanna mess up as it's a consequent investissment for me and it's like the central element of my house, i work/play/create/earn my life with it.
Thank you so much for your advices. I'm going already in the good way.