Video card compatibility

I am looking for a video card that is compatible with my system. I would like something at least equal to a GeForce2 GTS. My system is:
Item Value
Motherboard
Manufacturer ASUSTek Computer INC.
Model Kelut
Version 2.02
Serial Number MB-1234567890
BIOS
Vendor Phoenix Technologies, LTD
Version 3.11
Release Date 2-Sep-2004
CPU
Name AMD Athlon(tm) XP 3100+
Family K7
Model Athlon (BT core)
Manufacturer AMD
Calculated Core Speed 2,200 MHz
CPU Socket Socket A
Graphics Card
Adapter Name VIA/S3G UniChrome IGP
Video RAM 64 MB
Driver Version 6.14.10.0212-16.94.42.16
Operating System
Operating System Microsoft Windows XP Home Edition
Service Pack 3.0
Build 2600
Internet Explorer Version 8.0.6001.18702
DirectX Version DirectX 9.0c
Memory
Total Memory (RAM) installed in this PC 960 MB
Memory Used 55 %
Total Page File Memory 1,878 MB
Available Page File Memory 1,433 MB
Total Virtual Memory 2,048 MB
Available Virtual Memory 1,858 MB
Hard Disks Info (IDE and Serial-ATA)
IDE 0 Manufacturer Model Number SAMSUNG SP1604N
IDE 0 Manufacturer Revision Number TM100-24
IDE 0 Manufacturer HDD Serial Number S013J20X817083
IDE 0 Buffer Size 2 MB
IDE 0 Cylinders 16,383
IDE 0 Heads 16
IDE 0 Sectors Per Track 63
IDE 0 Capactiy 149.05 GB

Any suggestions? I am going to do a build soon so this is to get me by until then

if there is a brown slot on ur board above ur pci slots, u can use any agp card, the 4670 is the best