I was thinking of building a new PC but can't decide which to build. I've got about a ~$2100 budget.

Jessica Mark I

*CPU/Core i7 3770K Ivy Bridge Quad Core processor
*Motherboard/ECSH2-AX Gold Edition
*Memory/G Skill RipJaws X Series 16GB (2x8GB) 1600MHz 240pin dual channel memory kit
*GPU/MSI GTX 680 TwinFrozr
*PSU/Corsair TX850 850W power supply
*Coolermaster HAF-XM Mid Tower Case
*Hard Drive/Seagate Barracuda 1TB 7200RPM 64MB Cache Internal Hard Drive
*Optial Drive/ASUS Blu-Ray Internal disk drive
*CPU cooler/ZALMAN CNPS9900MAX-R

Approximately $1,710.91
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Susan Mark I

*CPU Intel Core i7 3820 Sandy Bridge 3.6GHz Quad-Core processor
*Motherboard MSI Big Bang X-Power II LGA 2011 X79
*Memory Corsair Dominator Platinum 16GB (4x4 GB) 1866MHz Quad Channel memory kit
*Power Supply Corsair HX850 850W Power Supply
*GPU MSI GTX 680 TwinFrozr
*Hard Drive Seagate Barricuda 1TB 7200 RPM 64GB Cache
*Case Coolermaster HAF-X full tower case
*Optical drive Internal Blu-Ray

Total $1,854,93 approximately.