Serious gaming    
   
Motherboard $95 ASUS M2N-E Socket AM2 NVIDIA nForce 570 Ultra MCP ATX AMD Motherboard - Retail
CPU $266 AMD Athlon 64 X2 4600+ Windsor 2000MHz HT Socket AM2 Dual Core Processor Model ADA4600CUBOX - Retail
RAM $160 Patriot 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Unbuffered Dual Channel Kit System Memory Model PDC22G5300LLK - Retail
Video Card $235 connect3D 3056 Radeon X1900XT 512MB GDDR3 PCI Express x16 Video Card - OEM
Case $47 CHENMING 301KEB-0-0 Black Steel ATX Mid Tower Computer Case - Retail
Power Supply $65 Antec TRUEPOWERII TPII-550 ATX12V 550W Power Supply 115/230 V UL, TUV, CB, FCC CLASS B, CUL - Retail
Fan x2 $8 ARCTIC COOLING AF8025 80mm Fluid Dynamic Bearing Case Cooling Fan - Retail
Sound Card $28 CHAINTECH AV-710 7.1 Channels 24-bit 192KHz PCI Interface Sound Card - Retail
Hard Drive $80 Seagate Barracuda 7200.10 (Perpendicular Recording) 250GB 3.5" SATA 3.0Gb/s ... - OEM
Hard Drive $80 Seagate Barracuda 7200.10 (Perpendicular Recording) 250GB 3.5" SATA 3.0Gb/s ... - OEM
DVD Burner $30 NEC 16X DVD±R DVD Burner Black IDE/ATAPI Model ND-3550A - OEM
DVD Burner $32 SAMSUNG 16X DVD±R DVD Burner With 5X DVD-RAM Write and LightScribe Black ATA/ATAPI Model SH-S162L/BEBN - OEM
Sum $1,125  
   
   
Photo/video editing and processor intensive modeling
   
Motherboard $95 ASUS M2N-E Socket AM2 NVIDIA nForce 570 Ultra MCP ATX AMD Motherboard - Retail
CPU $266 AMD Athlon 64 X2 4600+ Windsor 2000MHz HT Socket AM2 Dual Core Processor Model ADA4600CUBOX - Retail
RAM $160 Patriot 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Unbuffered Dual Channel Kit System Memory Model PDC22G5300LLK - Retail
Video Card $209 ATI All-in-Wonder X1900 256MB GDDR3 PCI Express x16 Video Card/TV Tuner - 100-714800 from Buy.com
Case $47 CHENMING 301KEB-0-0 Black Steel ATX Mid Tower Computer Case - Retail
Power Supply $65 Antec TRUEPOWERII TPII-550 ATX12V 550W Power Supply 115/230 V UL, TUV, CB, FCC CLASS B, CUL - Retail
Fan $8 ARCTIC COOLING AF8025 80mm Fluid Dynamic Bearing Case Cooling Fan - Retail
Sound Card $28 CHAINTECH AV-710 7.1 Channels 24-bit 192KHz PCI Interface Sound Card - Retail
Hard Drive $80 Seagate Barracuda 7200.10 (Perpendicular Recording) 250GB 3.5" SATA 3.0Gb/s ... - OEM
DVD Burner $30 NEC 16X DVD±R DVD Burner Black IDE/ATAPI Model ND-3550A - OEM
DVD Burner $32 SAMSUNG 16X DVD±R DVD Burner With 5X DVD-RAM Write and LightScribe Black ATA/ATAPI Model SH-S162L/BEBN - OEM
Sum $1,020  
   
   
Occasional gaming and multitasking
   
Motherboard $95 ASUS M2N-E Socket AM2 NVIDIA nForce 570 Ultra MCP ATX AMD Motherboard - Retail
CPU $183 AMD Athlon 64 X2 4200+ Windsor 2000MHz HT Socket AM2 Dual Core Processor Model ADA4200CUBOX - Retail
RAM $135 pqi POWER Series 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 533 (PC2 4200) Dual Channel Kit System Memory Model MAB42GUOE-X2 - Retail
Video Card $115 BFG Tech BFGR76256GTOCE Geforce 7600GT 256MB GDDR3 PCI Express x16 Video Card - Retail
Case $47 CHENMING 301KEB-0-0 Black Steel ATX Mid Tower Computer Case - Retail
Power Supply $25 Thermaltake TR2 W0070 ATX 430W Power Supply 115/230 V - Retail
Hard Drive $70 Western Digital Caviar SE16 WD2500KS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
DVD Burner $30 NEC 16X DVD±R DVD Burner Black IDE/ATAPI Model ND-3550A - OEM
Sum $700  
   
   
Normal business tasks, good future-proof computer
   
Motherboard $95 ASUS M2N-E Socket AM2 NVIDIA nForce 570 Ultra MCP ATX AMD Motherboard - Retail
CPU $149 AMD Athlon 64 X2 3800+ Windsor 2000MHz HT Socket AM2 Dual Core Processor Model ADA3800IAA5CU - Retail
RAM $77 G.SKILL Extreme 1GB 240-Pin DDR2 SDRAM DDR2 533 (PC2 4200) System Memory Model F2-4200PHU1-1GBNT - Retail 
Video Card $68 eVGA 256-P2-N443-LX Geforce 7300GT 256MB GDDR2 PCI Express x16 Video Card - Retail
Case/Power Supply $41 ASPIRE ATX288KL-BK/420 Black/Silver Steel ATX Mid Tower Computer Case 350W Power Supply - Retail
Hard Drive $70 Western Digital Caviar SE16 WD2500KS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
DVD Burner $30 NEC 16X DVD±R DVD Burner Black IDE/ATAPI Model ND-3550A - OEM
Sum $530  
   
Accessories    
   
Monitor (19 inch) $210 BenQ FP93GX Black 19" 2ms LCD Monitor 300 cd/m2 700:1 0.294mm Pixel Pitch - Retail
Keyboard $10 LITE-ON Beige Wired Keyboard - Retail
Mouse $63 Logitech G7 931375-0403 2-Tone 6 Buttons 1x Wheel USB RF Laser Mouse - OEM
Router $55 LINKSYS WRT54GL IEEE 802.3/3u, IEEE 802.11b/g Wireless-G Broadband Router - Retail
Microphone $13 ALTEC LANSING ABM200 Black 3.5mm Connector Microphone - Retail
TV Tuner $54 ATI TV WONDER PRO PCI TV Tuner Card - Retail
Speakers $34 Logitech X-230 32 Watts 2.1 Black Speakers - Retail
USB Drive $39 CORSAIR 1GB Flash Drive (USB2.0 Portable) w/ Bi-stable Cholesteric Display (BCD) Model CMFUSBREADOUT-1GB - Retail 
Printer $358 Canon imageCLASS MF5750 9867A005AA 21 ppm Laser MFC/All-In-One Monochrome Printer - Retail
   
Core Duo:    
CPU $250 Intel Core 2 Duo E6400 Conroe 1066MHz FSB LGA 775 Processor Model BX80557E6400 - Retail
CPU $370 Intel Core 2 Duo E6600 Conroe 1066MHz FSB LGA 775 Processor Model BX80557E6600 - Retail