Howdy friend
Not sure why you've decided to opt for the Z97-A, you are unlikely to need anything more than the MSI Z97-G43 / MSI Z97S SLI PLUS. They're reliable, have a sturdy BIOS with a pretty and feature rich UI. They'll also overclock to your hearts desire. If you are wanting to go hard on overclocking, sure spend some more, but equally do more research. Overclocking is easy these days, but once you start venturing in overvolting, you can still trash any system. So, cheaper motherboard is my first recommendation.
H100 is far superior to the H60, in fact, I wouldn't even recommend the H60 over just solid air cooling. Closed circuit water cooling is tempting, and the H100 will reduce performance loss on your GPU over time, but in 5 years do you still want to be using the same CPU? Are you concerned about losing a few points on stress tests, even if your gaming is practically unaffected? The H100 is great, don't get me wrong, but third-party air cooling can do a fantastic job, keeping those OC temps below 40C for a long time to come.
Ensure the HDD is SATA-6Gbs, 7200RPM and has a 64MB cache. No point in having Deep Thought if he's recalling from tape.
I'd advise the RAM be 1600Mhz. I strongly recommend against 6000Mhz OC RAM at a grand a stick, there are more entertaining ways to empty a bank account.
Investing in your case will help a lot; cheap cases can be like shoving your hand in a bucket razor blades, and you'll be missing a vital screw to boot.
Finally, what PSU?! Don't cheat your PC a high quality PSU; it's the heart of the beast. Throw in some off-brand 1000W ebay find, and you'll sorely regret it when it puts the whole system into cardiac arrest. For your build you're safe not going above 500W. 600W will give you headspace for miles. Your GPU needs two 6 pin power supplies, most PSU's for gaming will have them, but just make sure. The OCZ ZT 550W is a representative example of a good PSU.
It shouldn't be difficult, just have the right tools. I rarely need more than my screwdriver. A long one, magnetic head (don't rub it on your components though), and in good condition. Some will say it doesn't matter, and admittedly I've never had an issue, but try and stay grounded throughout the build (as in, release any static electricity into the ground by touching something to earth you, like the unpainted corner of a radiator). Everything is pretty fool proof though.
Above all, take your time, don't be hard on yourself, enjoy the process. You'll be witnessing the miracle of birth. That's what people mean by that right?
