I would not use a CX power supply with a build costing that much. Also, you wouldn't be using a Phanteks if you weren't thinking of serious overclocking and the CX is not the way to get ya there. Instead of the $197 ya paying for the Cougar case and budget PSU, I'd upgrade both to the Corsair 500R / HX850 which is a 10.0 jonnyguru rated PSU for just $13 more.
Phanteks cooler is the best available but look at AS5's web site before ya buy it:
Due to the unique shape and sizes of the particles in Arctic Silver 5's conductive matrix, it will take a up to 200 hours and several thermal cycles to achieve maximum particle to particle thermal conduction and for the heatsink to CPU interface to reach maximum conductivity. (This period will be longer in a system without a fan on the heatsink or with a low speed fan on the heatsink.) On systems measuring actual internal core temperatures via the CPU's internal diode, the measured temperature will often drop 2C to 5C over this "break-in" period. This break-in will occur during the normal use of the computer as long as the computer is turned off from time to time and the interface is allowed to cool to room temperature. Once the break-in is complete, the computer can be left on if desired.
So by my estimation of this statement it would take almost a year of normal use to properly cure the AS5 compound, or almost nine days of continuous power cycles to meet their recommendation. Benchmark Reviews feels that this is a characteristically unreasonable requirement for any TIM product, and we do not support it. We want products that perform without the burden of sacrifice on our time, especially with some many competing products offering performance without this extra requirement.
Each product tested received the curing time recommended (see below), or approximately one hour of thermal cycling prior to testing when no cure time was specified.
(0) No Curing Time or Special Application Suggested
(4) Arctic Silver 5 Application Instructions (up to 200-hours recommended curing time)
So get the Shin Etsu and save yaself the 1 year wait