Help upgrading a gaming desktop- $600 budget

Hey guys,

So at the moment I am using an Alienware desktop. Here are the stats:

•Processor 1◦Name: AMD Athlon(tm) 64 X2 Dual Core Processor 6400+
◦Manufacturer: AuthenticAMD
◦Caption: x64 Family 15 Model 67 Stepping 3
◦Version: Model 3, Stepping 3
◦Processor Id: 178BFBFF00040F33
◦Current Clock Speed: 3200MHz
◦Address Width: 32Bits
◦Data Width: 64Bits
◦Socket Designation: CPU 1

•Verified Hardware Device against Order: CPU-3.20AMDX26400

System Memory
•Memory Module 1◦Capacity: 0MB
◦Bank Label: DIMM #1
◦Mem_Type: DDR2
◦Mem_Frequency: 802.6 MHz

•Memory Module 2◦Capacity: 1024MB
◦Bank Label: Module format Regular UDIMM
◦Mem_Type
◦Mem_Frequency: 802.6 MHz
◦Verified Hardware Device against Order: MEM-DDR21GBPC64QME

•Memory Module 3◦Capacity: 0MB
◦Bank Label: DIMM #2
◦Mem_Type: DDR2
◦Mem_Frequency: 802.6 MHz

•Memory Module 4◦Capacity: 1024MB
◦Bank Label: Module format Regular UDIMM
◦Mem_Type
◦Mem_Frequency: 802.6 MHz
◦Verified Hardware Device against Order: MEM-DDR21GBPC64QME


BIOS Information
•Manufacturer: American Megatrends Inc.
•Name: BIOS Date: 03/20/08 Ver: 08.00.14
•Version: 1002
•Version: ALWARE - 20080320

Motherboard Information
•Manufacturer: ASUSTeK Computer INC.
•Product: M3A32-MVP DELUXE
•Serial Number: MS1C83B15201397
•Version: Rev 1.xx
•Verified Hardware Device against Order: MB-ASUSM3A32-MVPDLX
•Verify correct motherboard
•Power settings optimized

Video Adapter
•Caption: NVIDIA GeForce 9600 GT
•Adapter RAM: 512MB
•DriverVersion: 7.15.11.7416
•Verified Hardware Device against Order: VID-EVG9600GT512MBOC
•Connect Power Cable
•Test Video Card

Hard Drive(s)
•ST3250410AS ATA Device◦Model: ST3250410AS ATA Device
◦Size: 250GB
◦Total Heads: 255
◦Total Cylinders: 30401
◦Total Tracks: 7752255
◦Tracks Per Cylinder: 255
◦Verified Hardware Device against Order: HD-SEA250GBSATA16MB
◦Verify Correct Hard Drive Size

•High Definition Audio Device◦Device Name: High Definition Audio Device
◦Description: High Definition Audio Device
◦Class: MEDIA
◦Service: HdAudAddService
◦Driver Version: 6.0.6000.16386
◦Driver Date: 6-21-2006
◦Vendor Id: 11D4
◦Device Id: 198B
◦Revision: 1004
◦Verified Hardware Device against Order: SND-ASUSM3A32-MVP

•HL-DT-ST DVD-RAM GSA-H55N ATA Device◦Device Name: HL-DT-ST DVD-RAM GSA-H55N ATA Device
◦Description: CD-ROM Drive
◦Class: CDROM
◦Service: cdrom
◦Driver Version: 6.0.6001.18000
◦Driver Date: 6-21-2006
◦Verified Hardware Device against Order: STR-LG20XGSAH55NDVD

•Killer NIC Gaming Adapter◦Device Name: Killer NIC Gaming Adapter
◦Description: Killer NIC Gaming Adapter
◦Class: System
◦Service: NBv834x
◦Driver Version: 3.1.3.0
◦Driver Date: 10-6-2007
◦Vendor Id: 1957
◦Device Id: 0086
◦Revision: 0011
◦IRQ Number: 21
◦Verified Hardware Device against Order: NIC-BIGFOOTKILLERRV2

___________________________________

So I intend on spending about $600 on the upgrade, for the purpose of running upcoming games on med-high settings. Example of some games I wanna play are Dark Souls II and Elder Scrolls Online.

I basically want to be able to run high fps, while getting some pretty good graphics. I got this desktop in 2007, so I'm assuming that these parts are going to be pretty outdated.

Ideally I'd like to make this in about 2 weeks.

Feel free to suggest whatever parts you think I'll need (baring in mind the $600 budget). It may come to the point where all I'll keep from the Alienware is the super cool case design (/sarcasm).

Thanks a lot for reading!