Also, are you keeping your current monitor, keyboard, mouse? $2k is pretty high luckily, so you can get a lot of computer for that price.
Here is something I put together rather quickly:
Spoiler CORSAIR Professional Series Gold AX850 (CMPSU-850AX) 850W ATX12V v2.31 / EPS12V v2.92 80 PLUS GOLD Certified Full Modular ...
Item #: N82E16817139015
Return Policy: Standard Return Policy
-$10.00 Instant
$15.00 USD Mail-in Rebate
$189.99
Intel Core i7-3770K Ivy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770K
Item #: N82E16819116501
Return Policy: CPU Replacement Only Return Policy
-$15.00 Combo
$329.99
Newegg Promotional Gift Card - $15.00
Item #: N82E168GC000001
Your Promotional Gift Card will be emailed 4 days after invoice.
SAMSUNG EcoGreen F4 ST2000DL004 2TB SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Item #: N82E16822152245
Return Policy: Standard Return Policy
$129.99
EVGA 04G-P4-2673-KR GeForce GTX 670 Superclocked+ w/Backplate 4GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support ...
Item #: N82E16814130785
Return Policy: VGA Standard Return Policy
-$30.00 Instant
$469.99
CORSAIR Vengeance 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ16GX3M4A1600C9
Item #: N82E16820233143
Return Policy: Memory Standard Return Policy
-$9.00 Instant
$95.99
Noctua NH-D14 120mm & 140mm SSO CPU Cooler
Item #: N82E16835608018
Return Policy: Computer Cables and Accessories Extended Return Policy
$95.99
Intel 520 Series Cherryville SSDSC2CW240A310 2.5" 240GB SATA III MLC Internal Solid State Drive (SSD) - OEM
Item #: N82E16820167088
Return Policy: Limited Replacement Only Return Policy
-$50.00 Instant
$249.99
Corsair Obsidian Series 650D (CC650DW-1) Black Steel structure with black brushed aluminum faceplate ATX Mid Tower Computer ...
Item #: N82E16811139006
Return Policy: Standard Return Policy
-$10.00 Instant
-$30.00 Combo
$10.00 USD Mail-in Rebate
$159.99
ASUS SABERTOOTH Z77 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Item #: N82E16813131821
Return Policy: Standard Return Policy
-$9.00 Instant
$240.99
Grand Total:* $1,962.91
This is from Newegg.ca, I noticed the shipping is kind of pricey compared to the American version. There are $25 worth of MIR not included in the price. There is also a $15 gift card with the CPU purchase. There are some combo deals in there, too, the Case + PSU, and the Mobo + CPU.
The things I'd stick to are an SSD for your OS, Skyrim and the CK. If you game anything else, create a Games partition on the 2TB HDD. I don't know if you are an overclocker, but the 3770K is a good CPU regardless. The non-K version is only $20 less, and doesn't have the $15 gift card.
The case is kind of big, but it's awesome. For CPU cooling I have the Corsair H100 instead of a Noctua. The standard fans are kind of loud though, so I'm going to be replacing them.
GTX 670/680 4GB are kind of a must. A modded Skyrim does exceed 2GB VRAM. I've seen screenshots of ENB presets and such that actually show the VRAM usage above 3GB as well. The ATI/AMD cards have 3GB, and they are still an option. But honestly, Skyrim prefers Nvidia. I've looked into this heavily.
Do not go AMD by any means. Skyrim is heavily CPU dependent and AMD CPUs http://www.techspot.com/review/467-skyrim-performance/page7.html That is from the last gen of CPUs, but nothing has changed. Actually, I have the 3930K, which is a bump down from the 3960X ... You can see in the bottom chart it does significantly better than the other CPUs. This isn't because it has 6 cores, but because it has a much larger cache size. Skyrim seems to prefer large caches.