It really will be Christmas
Nice rig! For those of us who like to play on laptops, it's a tougher call :S
Are we getting to the stage will last longer than Moore's law would suggest? I was amazed the consoles lasted 8 years.
Do let us parsimonius beta testers how it is for you
...thinking about it though i probably have bought a PS4 and an Xbox one with the money ive spent! because the recent developments - a factual one that is the quite significant drop of the price of higher end GPUs point out now as a great timing to purchase a gaming PC.. Really you should concentrate on the slowest part of your system... your storage. Cpus and Gpu have overtaken software in the development race for the last 3 years or so unless you have multi displays or a nice 4K monitor. The vast majority on here will be maxed at 1920 x 1080, current mid range Cpu and Gpu from Intel, Amd and Nvidia will all happily handle anything at that resolution, i.e. Intel i5s or above with a real Gpu sitting alongside. For real giggles, have a look at something like a LSI96xx raid card and say 4 Samsung 128GB Evos in RAID0 and 4 of favourite 2TB spindle drives in RAID1 or 5 to back up the SSDs. Then comeback and talk about system smoothness. 16GB of Ram is handy as well, spend a day or two tuning it to the max and when you've found that, dial it back 5% to 10%., Steel Series for keyboard and mouse, CH Products for Hotas. High enough outlay at the buyin but these will all last more that 5 to 7 years. Cpu and Gpu I buy in a couple of months after the latest and greatest is released and I get the 2nd thier of the previous generation. 
Maybe you need to look at a laptop with a Desktop cpu or a server chip with a 6 core i7 4960X or a 8 core Xeon E5 2680. If you really have the money 12 core Xeon E5 2697 chipNice rig! For those of us who like to play on laptops, it's a tougher call :S
Are we getting to the stage will last longer than Moore's law would suggest? I was amazed the consoles lasted 8 years.
Do let us parsimonius beta testers how it is for you
With dual NVidia GTX 780 4gb. Then toss 8 to 32gb of ram.Now what kind of respect is that Good sir!?
I think our discussions have been quite useful, in pushing people to one camp or the other - either way, everyone made a decision that was (hopefully) best for them.
I never said it was a terrible idea. I said to think twice and be sure!
As far as recent developments go, the X99 and new processors will be a whole new start of architecture, which is the difference between upgrading a CPU, and replacing a whole system in a few years. So not really unreasonable to think about, is it? If you intend to run two GPU's, similarly, the next gen architecture will give significant longevity, and might be worth waiting for if your rig is up to running ED okay.
For those that are upgrading now, I would say a nice mid-road compromise is a decent board (that can run 2 x8 lanes for the Video Card for crossfiring/SLI) and the 4670K as a sweet little base - use your existing GPU, hang onto it as long as you can, then throw in a modified R9 290. Then, six months later, throw in a second identical one and crossfire. Mmmmmm... You'll be right with that system for some time! Couple with a SSD for blistery performance.
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