How much Power Supply do i need for this computer

Gamer Paladin D670
Case ( PSI ArmorX Gaming Tower Case - Red )
Processor ( [=== Quad Core ===] Intel Core 2 Quad Processor Q9400 (4x 2.66GHz/6MB L2 Cache/1333FSB) )
Motherboard ( [SLI] Asus P5N-D -- Nvidia nForce 750i SLI Chipset w/7.1 Sound, Gb LAN, S-ATA Raid, USB 2.0, IEEE-1394, Dual PCI-E MB - EPU Technology )
Memory ( 4 GB [2 GB X2] DDR2-800 PC6400 Memory Module - Corsair-Value or Major Brand )
Video Card ( NVIDIA GeForce 9500GT – 1GB - SLI Mode (Dual Cards) )
Case Lighting ( Cold Cathode Neon Light - Blue )
Power Supply ( 800 Watt -- Power Supply - SLI Ready )
Processor Cooling ( INTEL Certified Liquid CPU Cooling System kit )
Video Card Brand ( Major Brand Powered by NVIDIA )
Primary Hard Drive ( 320 GB HARD DRIVE -- 16M Cache, 7200 RPM, 3.0Gb/s - Single Drive )
Data Hard Drive ( None )
2nd Optical Drive ( 16X DVD-ROM Drive - Black )
Optical Drive ( 22X Dual Format/Double Layer DVD±R/±RW + CD-R/RW Drive - Black )
External Hard Drives [USB 2.0/eSATA] ( None )
Sound Card ( 3D Premium Surround Sound Onboard )
Speaker System ( iBUYPOWER 2.1 Channel Stereo Super Bass Subwoofer Speaker System )
Network Card ( Onboard LAN Network (Gb or 10/100) )
External Wireless Network Adapter ( Zonet ZEW2545 802.11n 130Mbps Wireless USB Adapter )
Floppy Drive ( None )
Monitor ( None )
Keyboard ( iBUYPOWER USB Keyboard - Black )
Mouse ( iBUYPOWER Internet Mouse - Black )
Operating System ( Microsoft Windows Vista Home Premium + [Free 60-Day !!!] Microsoft Office 2007(Word, Excel, Outlook, PowerPoint, Access ....) - 64-Bit )
Warranty ( Standard Warranty Service - Standard 3-Year Limited Warranty + Lifetime Technical Support )
Rush Service ( Rush Service Fee (not shipping fee) - No Rush Service, Estimate Ship Out in 5~10 Business Days )
Advanced Build Options ( iBUYPOWER Specialized Advanced Packaging System - Protect your investment during transportation! )
Advanced Build Options ( Professional wiring for all cables inside the system tower - Achieve exceptional airflow in your chassis )
Advanced Build Options ( Tuniq TX-2 High Performance Thermal Compound - The best interface between your CPU and the heatsinks )
Video Camera ( None )
Power Protection ( None )
Headset ( None )
Meter Display ( None )
Flash Media Reader/Writer ( 12-In-1 Internal Flash Media Card Reader/Writer - Beige )
MP3/MP4 Player ( None )
USB Flash Drive ( None )
2nd Monitor ( None )
Windows 7 Upgrade Coupon ( [*** Free Upgrade ***] Windows 7 Home Premium 64-Bit Edition )
iBUYPOWER Labs - Noise Reduction ( None )
iBUYPOWER Labs - Internal Expansion ( None )
Netbook / Notebook Bundle ( None )




Will 800W be enough power to attain good performance out of this badboy? or should i go for more. (P.S. I don't plan to OC, mostly because i have no idea how to, but i've heard it can short out your system, etc.) IDK SO LET ME KNOW.

oh alright sweet, any other recommendations in regards to processors or Hard drives , basically anything that wont break the bank, but still give me nice performance.