Couple of things about the choices :
If Warcraft 3 is the 'only' game you really want to play, the 9200 Radeon listed here has VIVO and is quite capable of playing games like WC3. VIVO means you can plug a VCR into your graphics card and record videos, then rip DVDs from those, and the utilities to do so should be included with it.
If you have a dual channel DDR mobo as many here suggest, you need at least 2 DIMMS to make use of the 2 channels. One will cripple the NForce chipsets as they will then drop to single channel. Hence, 2 256Meg DIMMS.
Disk I/O will be a limiting factor ripping or copying videos of any kind. I would suggest SCSI, as most anyone doing serious disk I/O is using SCSI RAID. I have both a SCSI drive and a fairly new ATA drive, and I can tell you my 2 year old 15krpm scsi drive is still better for any kind of video recording or mp3 ripping. However, it's also outside your price range.
Most of the AMD processors below 2500+ will not support the 166/333DDR frontside bs speeds, hence the 2500 choice here (it also has more l2 cache).
ANTEC Beige Performance II Mini Tower Case with 300W Power Supply, Model "SX630II" -RETAIL
Specifications:
Case Type: Mini Tower Case
Color: Beige
Material: 1mm SECC Steel
Drive Bays: 5.25" x 3/0, 3.5" x 2/3 (external/internal)
Expansion Slots: 7
Front Ports: 2xUSB & 1xIEEE1394
Power Supply: 300W
Cooling System: 1x80mm Fans
Mainboard Compatibility: Standard ATX
Dimensions: 17.3"x8.1"x18.5" more info-> N82E16811129118
$66.00
$66.00
ASUS nForce2 400 Chipset Motherboard for AMD Socket A CPU, Model "A7N8X-X" -RETAIL
Specifications:
Supported CPU: Socket A AMD Athlon/Athlon XP/Duron Processors
Chipset: NVIDIA nForce2 400 + MCP
FSB: 400/333/266/200MHz
RAM: 3x DIMM for DDR400/333/266/200(Non-ECC,unbuffered) Max 3GB
IDE: 2x UltraDMA 133 up to 4 Devices
Slots: 1x AGP 8X, 5x PCI
Ports: 2xPS2, 1xCOM, 1xLPT,6xUSB2.0(Rear 4), 1xLAN, Audio Ports
Onboard Audio: Realtek ALC650 6CH w/ built in HP amplifier
Onboard LAN: Integrated NVIDIA MAC + Realtek 8201BL PHY 10/100Mbps
Form Factor: ATX more info-> N82E16813131468
$69.00
$69.00
POWERCOLOR ATI RADEON 9200 Video Card, 128MB DDR, DVI/VIVO, 8X AGP, Model "R92DV-C3L" -RETAIL
Specifications:
Chipset/Core Speed: ATI RADEON 9200/250MHz
Memory/Effective Speed: 128MB DDR/400MHz
BUS: AGP 1X/2X/4X/8X
Ports: VGA Out(15 Pin D-Sub)+VIVO+DVI connector
Support 3D API: DirectX®8.1, OpenGL®1.3
Cable/Accessories: 5 Cables, VGA via DVI Adapter, WinDVD, Driver CD, Manual
Max Resolution@32bit Color: 2048X1536@75Hz
Retail Box (See pics for details) more info-> N82E16814131215
$89.00
$89.00
AMD Athlon XP 2500+ "Barton", 333 FSB, 512K Cache Processor - OEM
Specification
Model: AMD Athlon XP 2500+
Core: Barton
Operating Frequency: 1.83GHz
FSB: 333MHz
Cache: L1/64K+64K; L2/512K
Voltage: 1.65V
Process: 0.13Micron
Socket: Socket A
Multimedia Instruction: MMX, SSE, 3DNOW!, 3DNOW!+
Packaging: OEM(Processor Only) more info-> N82E16819103378
$76.00
$76.00
Kingston ValueRAM 184 Pin 256MB DDR PC-2700
Specification
Manufacturer: Kingston
Speed: DDR333(PC2700)
Type: 184 Pin DDR SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 2.5
Support Voltage: 2.5V
Bandwidth: 2.7GB/s
Organization: 32M x 64 -Bit
Warranty: Lifetime through Manufacturer more info-> N82E16820141302
$59.00
$118.00
WD WESTERN DIGITAL "SPECIAL EDITION" 80GB 7200RPM EIDE HARD DRIVE MODEL # WD800JB - DRIVE ONLY
Specifications:
Size: 80 Gigabytes
Interface: IDE ULTRA ATA100
Seek time: 8.9ms
RPM:7200
Cache 8MB more info-> N82E16822144122R
$57.00
$57.00