Well the Corsair CX-series PSUs are not very high quality so I'd advice you to get one from XFX. Sice you have a Z87 motherboard and a k-series processor, your CPU should overclock really well. Because of that you should get a better CPU cooler than the stock one. I'd recommend the Cooler Master Hyper 212 Evo since it really has no viable competition in it's price range. If you want to spend more money then go for the Noctua nh-d14.