Justiceinacan :
I've read many reports of people getting 4.5 on air alone. On a much hotter and less refined AMD I've been able to do it, even. I think you're underestimating air coolers, ledhead. Geofelt gives a good explanation of them. Simply put ; water cooler exhausts directly out of the case. CPU fan heatsink will blow it away from the CPU, and a good tower style one out the back of the case. They're just different methods of relocating heat. CPU fans don't get particularly loud if they're the good kind, and the only real drawbacks are size.
The corsair GS600 wouldn't be my first pick for a PSU. It's channel well technology 80+ bronze...
Gaming performance is most heavily influenced by GPU, but you will want the i5 for future proofing CPU intensive games and stuff. It's not a bad pick but consider updating the GPU later on.
That motherboard is an 8 phase board which is pretty good. I'd expect making 4.4 GHz.
Thanks for the info on air cooling. I've yet to have a need not to use it. I honestly think that water cooling CPU's is a bit overrated at the moment for the price and headaches. I think water cooling GPU's is a greater need except the many restrictions NV put into pascal still leave limited returns. It'd be fun to see a 1080 pushing 3ghz stable.
I've only recently(last 1-2 years) been catching up on info about phases for both PSU's and MOBO's. It can get complicated quick. The most I've really ever taken my stuff past is 4.3-4.4 but since it really wasn't adding to anything I've kept them in the 4.1-4.2 area for longevity. Plus my knowledge is minimal for voltages/timings, I just try to keep 'em at or under 1.35v and make sure they don't really go above 65-70c.
I completely agree with you about CPU fans not usually being loud, I only mentioned it because I've read some forums where people really, really, nitpick 'em. I often tell people that my cases are as ugly as anything but they get the job done 24/7/365 and even when I've had one on a desk next to the monitor its about the same volume as a small desk fan on low.
My 2600k would take some effort for me to calculate how many hours it been on for at this point and how many different things its been used with but its easily in the thousands.
The 4930k has mainly been for 1440p/4k and probably only has about 5-900 hours on it now but except for futuremark or video conversions I rarely see its usage above 40%.
The only thing I'll say against air cooling: If you're in a relatively small room say a child's bedroom or dorm it can get pretty warm after a while w/o proper a/c-ventilation or windows. I never notice anything w/ my rig in the living room, but the bedroom definitely warms up after 3-4 hours on.