what cpu cooler should i get

Solution
Troublesome, the link on Enermax's page is broken so not sure what to tell you.

However, there are plenty of people who have built in that case using the Cooler Master Hyper Evo 212 and it is 159mm tall. The C5 is 160mm tall. So they are very similar in height.

It is a minor risk, but it should be fine.

https://pcpartpicker.com/builds/#e=57