That motherboard will not allow for overclocking your "K" processor, and it's not particularly good board, anyway. Suggest ASRock Extreme 4, or Gigabyte GA-Z77X-D3H, or depending on your intentions re GPU, possibly ASRock Z75 Pro3. You will need to fit aftermarket cooler, before overclocking. Suggest Coolermaster Hyper 212Evo. You will need low profile RAM, to avoid a clash.
Recommend you don't use Coolermaster for PSU. Seasonic, Corsair, Antec, XFX, PC Power&Cooling all good makes, but impossible to suggest rating, without knowing what GPU is being used.
Nothing wrong with keeping the ability to overclock, in reserve, to give you a boost, later. You need a suitable mobo, then all you need to do is add an aftermarket cooler, as and when. If you are going to fit some aftermarket cooler, later, you should use low profile ram. The high heat sinks, on some RAM modules, may be physically in the way, when you come to fit a decent cooler.
I would suggest 500w is more than adequate, but recommend you use a Corsair Cx500, rather than Coolermaster.