Power Supply question

Hello all,

I have a question concerning what power supply I would need for the build below. This is the one area I am ignorant on.

This is not a gaming machine it is for professional 3d modeling, rendering, and photoshop work (hence the 12 gig ram).

Basically I want to know if a 750 will be enough to handle the build without putting stress on it or if a 1k is needed. My concern is how much the ram and hard drives will add to the power consumption as per Ender's guide it recommends staying under 3/4 of the max output.

Thanks


Chassis Model: Special Deal Hot Seller - HAF 922
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i7 950 3.06GHz (Quad Core)
Motherboard: EVGA X58 LE Edition SLI (Intel X58 Chipset) (Model: 141-BL-E757-TR)
System Memory: 12GB DDR3 1600MHz Digital Storm Certified (Highly Recommended) (Hand Tested)
Power Supply: 750W Digital Storm Certified (Dual SLI Compatible) (Silent Edition Recommended)
Expansion Bay: - No Thanks
Hard Drive Set 1: Operating System: 1x (1TB Hitachi/Seagate (7200 RPM) (32MB Cache)
Set 1 Raid Options: - No Thanks
Hard Drive Set 2: Multimedia\Data: -1x (1TB Hitachi/Seagate (7200 RPM) (32MB Cache)
Hard Drive Set 3: Backup\Misc.: - No Thanks
Optical Drive 1: DVD-R/RW/CD-R/RW (DVD Writer 24x / CD-Writer 48x)
Optical Drive 2: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Video Card: 1x NVIDIA GeForce GTX 480 1.5GB (Includes PhysX Technology) (EVGA Brand)
Add-on Card: - No Thanks
Sound Card: Integrated Motherboard Audio
Extreme Cooling: AIR: Stage 1: Corsair A70 Dual 120mm Fans High Performance Cooler
H20 Tube Color:- Not Applicable, I do not have a FrostChill or Sub-Zero LCS Cooling System Selected
Chassis Airflow: Standard Factory Chassis Fans
Internal Lighting: - No Thanks
Enhancements: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
Boost Processor: FREE: Stage 1: Overclock the processor between 3.3GHz to 3.9GHz (Cooling Upgrade Recommended)
Boost Video Card: - No Thanks, Please do not overclock my video card(s)
Boost Memory: - No Thanks, Please do not overclock my memory
Boost OS: - No Thanks, Please do not tweak the services on the operating system

750 is enough, next to the video card, the power draw of most other things is pretty low

Thanks its been ordered