Raidmax Sagitta II Mid-Tower 420W Gaming Case w/ Side-Panel Window
CS_FAN: Extra Case Cooling Fan with 2 extra fans
CPU: (Quad-Core)Intel® Core™ 2 Quad Q9650 @ 3.0GHz 1333FSB 12MB L2 Cache 64-bit
CD: (Special Price) LG 20X DVD±R/±RW + CD-R/RW DRIVE DUAL LAYER
FLASHMEDIA: INTERNAL 12in1 Flash Media Reader/Writer
FAN: Ultra ChillTec Thermo Electric CPU Cooler
HDD: Single Hard Drive (300GB Gaming Western Digital VelociRaptor 10,000RPM SATA-II 3.0Gb/s 16MB Cache WD3000GLFS
MULTIVIEW: Xtreme Performance in SLI/CrossFireX Gaming Mode Supports Single Monitor
MOTHERBOARD: (3-Way SLI Support) Asus Striker II Formula nForce 780i SLI Mainboard FSB1333 DDR2 3 x PCIe X16 SATA RAID w/ USB2.0,IEEE1394,&7.1Audio
MEMORY: 8GB (4x2GB) PC6400 DDR2/800 Dual Channel Memory (Corsair XMS2 Xtreme Memory w/ Heat Spreader Or would Corsair or Major Brand cut it?
NETWORK: ONBOARD 10/100 NETWORK CARD
OS: Microsoft® Windows Vista™ Ultimate w/ Service Pack 1 (64-bit Edition)
POWERSUPPLY: 1,200 Watts Power Supplies (Thermaltake ToughPower 1,200 Watts Power Supply - Quad SLI Ready)
SOUND: 3D WAVE ON-BOARD 5.1 SOUND CARD
USB: Built-in USB 2.0 Ports
VIDEO: NVIDIA GeForce 9800 GTX+ 1GB 16X PCI Express (Major Brand Powered by NVIDIA) Or is NVIDIA GeForce GTX285 1GB 16X PCIe Video Card (Major Brand Powered by NVIDIA) better?
VIDEO2: NVIDIA GeForce 9800 GTX+ 1GB 16X PCI Express (Major Brand Powered by NVIDIA)
WNC: PCI Wireless 802.11g 54Mbps Network Interface Card
The bolded stuff is what I need help with. I understand the GTX285 is better then the GTX 9800 but by how much. Cause the price difference is steep. And would the basic ram (Corsair or Major Brand ) work better then the one in the specs?