I'll start with the PSU.
My general rule, only go with power supplies from a company who is well known. I would highly recommend Seasonic, as they make some of the best PSU's on the market right now. You really don't want to skimp on the PSU or go for shiny LED's for it to look 1337, funcionality and reliability comes first.
RAM is all the same stuff, whether it costs $400 or $40, so I would say get some cheaper RAM.
HDD. WD - Black are server grade harddrives and are rather pricey because of this, yes they are extremely reliable though. But I would say a Seagate Barracuda 1TB will do just fine.
Case. get something you can live with, but don't get spending $80 or more..It hurts me to see people spend $200 on a case. (Yes, I know it's your money, but come on, $200 on a case?..)
I'm not too up-to-date on 1150 Motherboards, so someone else will have to tell you if yours is a good choice or not.
Now, down to the main thing. Overclocking.
Overclocking on Haswell is much harder than on Ivy, mainly because Intel decided to cheap out on the IHS and essentially used mayonaiyse as thermal compound. So unless you're willing to De-lid, I would recommend going with an i5-3570k, as these have been proven to be far easier to OC than the Haswell replacement for it.
If you insist on Haswell, then I would say get a CoolerMaster 212 Evo PLUS..It's a very cheap, but very good air cooler. You can replace the fans with Deltas if need be and improve cooling even farther with the cost of increased noise.
CLC (Closed Loop Coolers) arre highly expensive and not neccisseraly worth the price as you can get much better results with a Custom Loop or air cooler. (CM 212+[$25] < Corsair H60i[$60-$75])
4.2 should be an easy OC to reach, but on Haswell. It's hard to say, if you get a good CPU, then you can easily reach 4.4..If you get a bad CPU, it will be hard to reach 3.9.
Wait untill October before buying the GPU, as the release of the 9000 series from AMD will drop GPU prices, some may even be better than the 700 series from nVidia.