For most people, 650-750W is still going to be plenty. Not everyone is rocking overclocked 16 core CPUs and top-tier GPUs. I'd go out on a limb and say 95% of all gaming PC's would fit comfortably in that wattage envelope (based on Steam Hardware Survey).
That said, 2 yr warranty is a bit low. I can kind of understand since this is a case, but it has an integrated PSU, and there isn't any mention of a separate warranty to cover that. On the other hand, it's Seasonic, and if there is still a PSU company out there to trust, this one is our last hope - and the only thing better than having a warranty is not needing the warranty.