I’m looking over your build right now, but yes. The power supply would be a relatively easy/cheap thing to replace. The wattage is fine (Assuming no weird LED/Cooling that isn’t listed).
EDIT: Ya, without any extras your load wattage is around 345. A 450 should be plenty for this one. As you don’t have a lot of listed cooling as extras, I would def. recommend a Gold+ rating to help reduce the overall heat as well as pull in power better.