I suppose it will come down to if you need capacity or if you need a decent balance of cas latency to clock speeds.I don't see DDR4 being an exceptionally useful asset for the high end X99 platform, but instead on memory hungry platforms such as FM2+ where the APUs rely heavily on the RAM speed. This is where it will really shine. Hopefully we'll one day see another samsung green era.
i built mine in 2012 too... got 16gb for 65...now it goes for ~150!uuuggh, and RAM was actually pretty cheap not to long ago. I got lucky as fuck, I built my first system in holiday times 2012, I got G.Skill ripjaws 8GB 1600MHz RAM for 25$ with free shipping from newegg. Now the exact same kit is around $60-$70.....
Edit: .....just kidding, it's $80 now: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314
And that is exactly why I jumped on low prices of DDR2 and DDR3 memory for both my desktops and laptops over the years. I've still got six memory kits of various types and speeds unopened. The others I either sold for a nice profit or finally upgraded older laptops and desktops with.There is a recurring pattern with new memory standards too:
1- when a new standard is introduced in the consumer market, it starts at about twice the price of the current standard
2- about a year later, the two standards reach price parity
3- another year or two later, the old standard becomes roughly twice as expensive as the new one