ohh, be careful with air coolers then, they might be bigger than the case allows and often only work with normal ram heights
I just bougth a asus rampage v extrem 2011-v3, hyperx predator 16 gb ddr4, i7 5960x and im thinking of upgrading my water cooler to a ek system.
Unless you a lot of money to throw away. Upgrade your i5 to a i7-4790k. It'll handle anything you throw at it, def with that 980ti. H100i cooler will do the trick.
Doesn't even have to be bigger. Some small cases support radiators too. ^^ Not everybody has the space for big cases and maybe he just likes this one.