I don't believe a 550W PSU can support all your parts, my PSU was near imploding when I plugged in my GTX 980 which resulted in bluescreening, suggest you get a 750W or higher.
^ I second this. 550W /may/ be enough, but better to have some extra headroom and a PSU isn't really an expensive part between 500-750w. Better to have it and not need it. Otherwise, it looks like a good machine.