I spent a couple hours last night researching corsair water coolers and those two you linked didnt gat good temps compared to even a air cooler like the sycthe mugen or katana. We are talking between 1-5 degree difference. Even with the H105 you are looking at around 5-8 degree difference max.
http://www.techpowerup.com/reviews/Corsair/Hydro_Series_H105/6.html
I understand you want to OC but the computer I built is almost silent even under load. The one you are wanting to build is going to be very loud and not that much more efficient.
The Fractal R4 has sound dampening foam inside so you put your fans where you ant and then seal up the rest. I can barely hear my machine standing next to it.
I dont think you would miss staying at stock with the CPU, Getting a GTX970 and a CPU block fan putting it into a fractal case. If you are gaming where your PC is you will notice a huge difference. When you are trying to play a game like Alien Isolation and all you hear is your damn fans blowing its not only annoying its down right distracting and mood breaking. And higher games will be louder.
Like Charlie98 said make sure that whatever case you get it is not sitting on carpet
One more thing about posting, instead of making 5-6 little posts use the edit feature, im surprised no one has said anything yet but you shouldnt really be multi posting, it could get you a warning from a MOD.