How much work do you need to do around a large heatsink? Install the RAM first then the Heatsink. Plug the 8pin CPU Power, plug the 24pin. Its really not any more difficult. And installation of the cooler is just 4 screws and a bracket. All us noobs used air coolers with more stupid brackets before corsair hydro came out and had no problems. Corsair system looks easy, that is it. People oh big cooler, lots of screws etc, its not a big deal at all.
The only reason to get a Corsair H cooler is for aesthetics or space requirements, which is not a problem in ATX.
Ive now used the H80i, in my current system, and the Silver Arrow IBE Extreme cooler. Both perform similarly, except at idle/gaming the H80i is much louder, which is annoying when you spend 2-3k on a system. I deliberated a lot on going on air, corsair stuff is last resort if you care about noise/performance/reliability > aesthetics.
Now for some reason now my H80i is causing my CPU to over heat, when previously it loaded at 75c. I dont trust corsair one bit anymore. If you really want water, get an XSPC kit, atleast it will give you consistent performance, and not be constantly RMA'ing your Corsair product due to shoddy QC. Corsair forum is full of problems too, they cant even get the correct voltage to the LEDs so they die after some period.
On the RAM, i suggested the 2x8Gb kit even though it is slightly more expensive to save the 2 slots for future expansion if ever needed. Worth it when spending this kind of money.