5 GHz is hard to hit, depending on your luck might not even hit it with watercooling. I highly doubt 5 Ghz is gonna happen on an evo.
CPU, cooler, and motherboard are good. I personally wouldn't spend on a thermal paste.
Things I would change:
The gpu is really weak relative to the cpu, something like a 770/970 or 280x/290x is better suited for that processor.
Raidmax is not a recommended case manufacturer, others have better quality for the price.
That psu is overkill for the build, a 550w xfx psu would leave lots of headroom for the future.
Those fans seem excessive and unnecessary.