Cost I guess would be a secondary concern. I'm willing to spend a few hundred dollars to make sure I get a unit that has good reviews, is compatible with my case and components, and has proven longevity.
Any decent 520w or better would power those specs
Longevity is a tough call, good quality power supplies are usually discontinued long before their warranty runs out so by the time we learn how long they can last they are no longer available
Seasonic and Seasonic built units under other brand names are generally the safest bet