Get the 3570K of you want to overclock. Whatever you do DO NOT get a raidmax power supply the are absolutely horrible and will fail and its very possible they will damage other components when it does. Get a PSU from a brand like Seasonic, Corsair, or XFX. Thiers cases arent that good either they look ok but a flimsy and made poorly.
With that build as is you should get the i5-3570, not the i5-3570K because the H77 Chipset motherboard is not designed for oveclocking. If you want to overclock, upgrade the motherboard to a Z77 model and get the i5-3570K. I agree with bignastyid regarding the PSU. Get a good quality PSU made by Corsair, Seasonic, XFX, Antec.