DDR4 offers almost nothing for desktop use that DDR3 LV doesn't offer. It's just a marketing game. Asus and Intel are both good at hyping worthless tech that isn't needed for years. DDR3 @1600 MHz is not a system bottleneck even on a enthusiasts performance level CPU powered desktop, thus DDR4 is just a future tech no one needs for years.
In addition DDR4 RAM uses a different topology so you must install all of the RAM as one kit. There is no adding RAM you must replace it all and it won't be cheap. THIS is why the RAM makers are pushing DDR4. For servers it has some value but not for desktop PCs.
AMD is pinning it's future on Kaveri and FM2+. Thankfully Kaveri is good for entry to mid-level desktop and will be very good for laptops. Other than that AMD has essentially abandoned the true discrete desktop market as there is no Steamroller upgrade for socket AM3+.
Kaveri is definitely worth talking about and the official release today is generating a lot of positive reviews.
Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.