IIRC, they DO make SIS chips, but (and I'm REALLY struggling to remember if this was for newer version AMD chips) I think they were for the cheaper boards.
For AMD, the nForce2 boards are the way to go. That's a Socket A you're looking for, and currently, NewEgg has a sweet board that I just bought, if you don't need some of these features, they sell the same board with fewer features for less money as well, just depends on what you want/need/can afford.
The one I'm getting is here:
http://www.newegg.com/app/ViewProductDesc.asp?description=13-131-478&depa=0Asus A7N8X-E Deluxe - $90
Features are as follows:
Chipset: NVIDIA nForce2 Ultra 400 + MCP-T
FSB: 400/333/266/200MHz
RAM: 3x DIMM for Dual-Channel DDR400/333/266 Max 3GB
IDE: 2x ATA 133 up to 4 Devices
that's IDE OR SATA, so you are covered no matter what type of drive you have, and can upgrade to SATA later, if you wantSlots: 1x AGP Pro/8X, 5x PCI, 1x Wi-Fi
the WiFi slot might not be needed by you, which will drop the price if you go with this board without the WiFiPorts: 2xPS2,1xLPT,1xCOM,2xLAN,6xUSB2.0(Rear 4),SPDIF Out,Audio Ports
Onboard Audio: Realtek ALC650 6-Channel Codec
Onboard LAN: Realtek 8201BL 10/100Mbps + Marvell 88E8001 GbE
BOTH types there...if you don't need Giga, it'll drop the price if you go with a board with either 2 10/100's or just a singleOnboard SATA/RAID: 2x Serial ATA by Silicon Image Sil3112A, RAID 0/1
don't need RAID? Again, cheaper if you don't, and go with another boardForm Factor: ATX
That board is considered a DYNAMITE board, and will range from $65-$90 at NewEgg, again, depending on features. The $65 board will probably be just fine (I'm guessing) for what you're gonna use it for, but in case you wanna check 'em out, here's a link for the various flavors of this board:
http://www.newegg.com/app/Viewproduct.asp?Submit=manufactory&catalog=22&manufactory=1315&DEPA=0&srchFor=Asus%20A7N8X