If money really isn't a factor you can go balls out and buy whatever the fuck you want and really can't go wrong. Most of my advice will probably be with value and noise in consideration, which you may take with a grain of salt if you dont care about those as much for certain parts/price points.
A CPU will make a marginal difference in terms of gaming performance. It will make a bigger difference in RTS's like Starcraft 2 and Civ 5, but then again those games aren't resource intensive enough that you need the best cpu anyway. A low end i5 will basically give very similar performance to the top end processor at a much cheaper price. Get the K version of the processor if you plan on overclocking.
Motherboard also makes very little difference in terms of gaming performance unless you plan on overclocking. If you aren't overclocking, getting a cheap one is perfectly fine.
Memory, I would just shoot for 16 GB, which will be plenty for pretty much anything in the forseeable future. Memory speeds are basically irrelevant, it's not worth paying a premium for faster memory. As you said, that's money much better spent into a better GPU.
In terms of graphics cards, AMD cards are currently much better value although they tend to sound like jet engines. Nvidia cards are quieter but have a little less bang for your buck, so it's up to you on that front. I would also recommend NOT going the SLI or Crossfire route unless money is REALLY no object and you're running like three monitors in eyefinity or something. It's complete overkill for current games, incredibly money inefficient, and generates a lot of heat and noise. It also can have the occasional compatibility issue and microstuttering can occur as well.
The Samsung EVO SSD's that Skiz uses are very solid. Follow the link I posted earlier the the thread to get even more performance out of it.
I personally find water coolers to be completely unnecessary unless again, you are planning on overclocking. A solid air cooler will almost always be quieter (no, liquid doesn't mean it's silent, there's still the pump/radiator) and will perform better at lower price points and with a better cooling/noise ratio. Only if you're investing a lot into a good water cooling will it out perform air cooling, and again, that's only if you plan on overclocking. No offence to Skiz, but the Corsair H series is not past that point.
PSU's and cases are really up to you. If you're find with the one's you have, re use them. Otherwise, buy another. The Fractal R4 Skiz uses is a very solid case, and I've heard a lot of good things about it. I generally feel like there isn't a really a big difference between PSU's other than noise. Getting a "platinum" rated PSU will in general cause it to make less noise since it's a lot more efficient and doesn't generate as much heat. Therefore the fans don't have to ramp up as much (and actually most platinum PSU's are "hybrid", in the sense that it'll stay passively cooled with the fan off until a certain load) and the PSU is a lot more quiet. Up to you whether that's worth the price premium.
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