You've gotten all kinds of answers haven't you? Here's the deal: you do not need hyperthreading on a CPU if you are gaming, which is the main selling point of the i7. The main thing that hyperthreading helps with are video editing, 3D rendering, and heavy multi-tasking. With an i5 you have 4 cores, so one core (or two or three) can run your game while another one can take on the task of your web browser or something light. Hyperthreading's main point is a processing trick for more efficient scheduling of the work to be done by your CPU. Most of the work done in gaming is done through your GPU (which does the rendering), not your CPU. Most games on the market simply can't take advantage of more than a couple of threads total. Hyperthreading is not nearly as good as more cores, but remember that unless you do a lot of 3D rendering, video editing or heavy-multitasking you don't even need a lot of those.
With that in mind, here is a build for $2000 I'd recommend. Note I'm including a CPU heat sink/fan solution instead of liquid cooling. If you are comfortable with installing it then go with the Cooler Master Glacer 240L, but don't go that way unless you've built PC's before or have experienced help. I'm going on the assumption that you will do overclocking, which is an important decision to make beforehand; if you're not let me know.
PCPartPicker part list:
http://pcpartpicker.com/p/wkckqs
Price breakdown by merchant: http://pcpartpicker.com/p/wkckqs/by_merchant/
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($209.99 @ Amazon)
CPU Cooler: Noctua NH-C14 CPU Cooler ($62.99 @ NCIX US)
Motherboard: Gigabyte GA-Z97X-SOC FORCE ATX LGA1150 Motherboard ($193.98 @ SuperBiiz)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Storage: Samsung 840 EVO 250GB 2.5" Solid State Drive ($118.99 @ Best Buy)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($56.98 @ OutletPC)
Video Card: EVGA GeForce GTX 780 Ti 3GB Superclocked Video Card ($649.99 @ Newegg)
Case: NZXT Phantom 530 (Black) ATX Full Tower Case ($107.99 @ NCIX US)
Power Supply: EVGA 850W 80+ Gold Certified Fully-Modular ATX Power Supply ($119.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($87.98 @ OutletPC)
Case Fan: Phanteks PH-F140XP_BK 85.2 CFM 140mm Fan ($12.99 @ Newegg)
Keyboard: Logitech K120 Wired Standard Keyboard ($9.99 @ B&H)
Mouse: SteelSeries Sensei RAW Wired Laser Mouse ($48.78 @ NCIX US)
Total: $1777.61
Seemed like you wanted an NZXT Phantom series so I got a full tower from that series that saved you $100, and got you one of the very beat heat sink/fan solutions for your CPU. The mobo is the fastest OC'ing motherboard that you can get in the Z97 chipset, and I inlcuded the gold standard in SSD's. Since the GPU matters most I got the GTX 780 Ti, which is the best you can get unless you're willing to pay $1000+ for a GPU. I also included a PSU that would handle it as well as another 780 Ti if you decide to SLI down the road. I included a case fan because your case just comes with two, and you'll want to mount another exhaust fan to create a negative pressure airflow. I skimped on the keyboard because I didn't know if you wanted a gaming or regular one, but I did get a killer gaming mouse. The Sensei or the Razer Deathadder are the two I'd recommend to anyone.
Right now I'd discourage anyone from getting the super-new X99 motherboards and the CPU's to go along with them...they are really expensive and it'll take at least a year or so before the technology matures enough for it to be worth it. You still have a couple hundred bucks to play with if you want a better keyboard or another couple sticks of ram or whatever, hope this gets you started!
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