Okay, just for comparisons sake and to try to frame my own thinking into something useful, I'll compare your setup with something similar to what I recommended and subsequently built for a friend of mine last month:
Core components are the motherboard, CPU and main system memory (RAM). For parity, prices are all newegg from today, 6/18:
My recommendation:
Intel i7-4770k (Hasewell a.k.a. Ivy Bridge) $339.99
Gigabyte Z87X-OC $189.49
G.SKILL Ripjaws Z Series 16GB (2 x 8GB) PC3-17000 11-11-11-31 Timing $159.99
Total cost before applicable taxes and shipping: $689.47
Your current build:
Intel i7-4820k (Haswell-E a.k.a. Ivy-Bridge-E) $324.99
GIGABYTE GA-X79-UP4 $242.99
Corsair Vengeance 16GB [4x4GB] PC3-12800 9-9-9-24 Timings $162.99
Total cost before applicable taxes and shipping: $730.97
Net result:
Both extremely comparable performance wise. The primary difference is in the socket. The build I recommended runs on Intel Socket 1150. This has been the primary socket for most high end gaming machines since Haswell processors first hit the market.
Your build utilizes Socket 2011, which was designed to be the workstation oriented solution. Notice the 8 system memory slots and the quad memory controller. Also, your build is the superior choice
IF you intend to run SLI. You have more I/O bandwidth courtesy of more PCI-E lanes (many 1150 boards make up for this with the addition of a PLEX chip, adding lanes to the Z87 chipset). I've found this to be a mute point, since most people, like yourself, get the best card they can and by the time that card drops significantly in price to make a cheap SLI setup, it's usually cheaper and more feasible to just upgrade the single GPU. This advantage is further nullified by the 4x4GB RAM configuration as the nice tight timings of those 4GB will not be utilized if you fill the other slots with larger modules that have looser timings (unless you get another 4x4GB kit to fill it out).
The rub:
The idea with sticking to Socket 1150 was that later Haswell designs would be cheap upgrades as the market penetration of 1150 almost certainly means there will be more parts released for the platform. The thinking being Socket 2011 would be a long ways off for an upgraded CPU and by then (Broadwell-E microarchitecture) it would be more expensive an upgrade as those are also workstation targeted parts a long ways off. But, true to form, Intel has screwed both of us. Improved Haswell chips that are Broadwell compatible will be Socket 1150 in name only, they are changing the pin out. Likewise, Broadwell-E parts are now expected to utilize the Socket 2011-3.
So in the end it's all pretty comparable. The smart bet was on 1150 to have a MUCH cheaper upgrade path, but no bet is a sure thing and we're both stuck in our respective platforms.
IF you ever go SLI, yours is the better choice. If you do not, then they are roughly comparable. Doubly so since neither chipset supports the upcoming DDR-4.
Glad to hear you upgraded the hard disc however, you'll want the space and those EVO SSD's are sweeeeet. You're going to be really, really pleased.
-Andy