3090 - will work great in this case, with ITX board and air cooling for CPU, I recommend 700-800W SFX supply
3080 - same, great fit, and will work with ATX board since it's true 2-slot. Now, regarding CPU cooling, I also recommend air, but if you like to tinker (find a solution to mount smaller fan to 120mm radiator, maybe modify the included bracket), you could use 120mm aio with something like 80mm fan, maybe even 92 but I need to see the exact dimensions to tell. I also recommend strong PSU, 700-800W. If you are brave, you could try some 600-650W unit if it's of really high quality, but I would just feel safer with 750W
3070 - this is actually the most interesting for me, since it's looks like it's less then 245 mm in length + 2-slot, and that means that you can use it with both ATX board and 120mm AIO! And also it's not so power hungry, so 600W PSU is more than enough. And it should have nice price to performance