That high profile Vengance has problems fitting under even small coolers. There is no way it will fit under a Phanteks. 8GB of DDR3 1600 is less than $40 though so you could always just replace the RAM while it's dirt cheap.
You sure you want to put a $100 cooler on a $100 CPU? You are not likely to get any more of an overclock than what you have listed. Maybe a few hundred megahertz you will never notice.