Get two Adidas Pro 3's. One for marathon training and long run, one for your marathon race. With Pro 3 you can do all your tempo runs marathon pace training and long runs. Your invincible 3's for daily training are good enough. To complete your rotation you can also get a pair of faster daily trainer ie. Noosa Tri 16, Adidas SL2, Hoka Mach 6, NB Rebel V4
The Zoom Fly 2s are underrated. Baisically Vaporfly 4% lite. Ypu should try out the Saucony Endorphin Speeds, super versitle, even cushy, but still snappy
People generally pronounce things the way they here it most. When I was growing up I never heard anyone say Nikey, it was always just Nike, so that's how I've always said it.