I think 500W PSU is ok for this configuration. I am pretty satisfied with my Seasonic S12.
You will also need some decent CPU cooler, because the Intel box cooler can be very loud and cooling is not the best. I can recommend you Scythe Ninja, solid construction and very efficient cooling, you can use as passive or active with 12cm fan.
As for the fans, you cant go wrong with low-noise Noctua fans. They are very good,.
Personally I would rather go for 2 HDDs instead of one. One for system and one for data storage.