I ended up with an Asus AM5 board because of a sale, but it boots in about 15-20 seconds after the first initial training boot. That first boot though -- I thought it was dead.
From everything I've seen since, i'm glad I pulled the trigger on discounted 5950x instead of waiting for next gen. 7950x3D is a really cool premise but constantly looks like it looks like the platform would annoy the hell out of me.