Ok, strictly because you're doing quite a bit of heavily threaded stuff, particularly video encoding and 3D modeling.
I would say go with AMD...if you have no budget within reason...here's a build I would suggest:
PCPartPicker part list:
http://pcpartpicker.com/p/16LAH
Price breakdown by merchant: http://pcpartpicker.com/p/16LAH/by_merchant/
Benchmarks: http://pcpartpicker.com/p/16LAH/benchmarks/
CPU: AMD FX-8350 4.0GHz 8-Core Processor ($179.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: Asus Crosshair V Formula-Z ATX AM3+ Motherboard ($214.99 @ Amazon)
Memory: Corsair Vengeance LP 8GB (2 x 4GB) DDR3-1866 Memory ($78.98 @ NCIX US)
Storage: Corsair Force Series GT 240GB 2.5" Solid State Disk ($204.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ NCIX US)
Video Card: Sapphire Radeon HD 7970 GHz Edition 6GB Video Card ($506.98 @ Newegg)
Case: Antec Eleven Hundred ATX Full Tower Case ($109.98 @ Newegg)
Power Supply: Corsair 860W 80 PLUS Platinum Certified ATX12V / EPS12V Power Supply ($169.99 @ Newegg)
Optical Drive: Asus BW-14D1XT Blu-Ray/DVD/CD Writer ($84.99 @ NCIX US)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $1730.84
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-15 17:40 EDT-0400)
You could go with a standard GHz edition 7970 instead of the Toxic and save about $100 if you wanted...you could also cut back on the SSD to 120 GB if you wanted and cut costs by another $80 or so too.