I'd prefer tempered glass and hinged - I'm over "sliding" panels. I'd also prefer white, I think.
Motherboard features aren't super important, except lots of USB slots - at least 8, preferably more. NVME isn't a massive deal either. 1-2 is fine as I only have 1 NVME SSD and it's connected to a PCI card. My other SSDs are Samsung 870 Evos. WiFi is whatever. Might be cool to have, but I've lived without it since building this in 2012. I always run wired, but I guess the option might be nice?
Do AIOs require reservoirs? If so, I'm not sure how much I want to fuck with all that. Might just go with air-cooled. How necessary is water cooling these days?
EDIT: Yeah, I'm really digging the 5000 series cases from Corsair. Any idea if the Airflow version offers a lot of extra cooling? I really don't like that mesh front-panel, but if it means a couple degree drop C, I'll probably bite the aesthetic bullet. Holy fuck did I get lost down a fucking rabbit hole of RGB though. I'm going to end up blowing hundreds on this fag lightshow.