Noctua wipe the floor with e V8, performs a fair bit better than the V10, while saving you money both in your electricity bill and initial purchasing price.
The Noctua can fit in your case, when it comes to RAM, if it's the Dominator RAM sticks, you may need to remove the top of the heatsink with the one nearest to the CPU, but don't worry it's RAM it's not gonna get hot and it won't explode or catch on fire if you remove the heatsink on top of it.