Look for a PC-Chips M758LMR+ ... graphics, 3D sound, 10/100 LAN, modem-on-a-riser, 133 MHz CPU and SDRAM support. SiS 630E chipset with C-Media 8738 sound/modem. All you need for basic computing - don't expect any performance miracles from those, especially not in the area of high-resolution 3D gaming. (The 3D engine is OK as long as you run your games in low resolutions.)
Regards, Peter