If you want a Socket A mainboard that has everything(built-in AGP Vidcard, decent Soundcard, and good 10/100 LAN card)right out of the box, it's hard to beat the Asus A7S-VM. You can play UT and Half-Life decently if you set aside 32 Mb of RAM for the Vidcard. The audio is plenty good enough, and the LAN card handles a DSL router just fine. Ram is cheap lately, so two DIMM slots isn't a real problem. Crucial PC-133 CL2 runs at CAS2 on a 133 Mhz Memory Bus.
This board has only modest FSB choices: 100, 103, 105, 110, 112, 124, 133, 137, 138, 140 and 150 Mhz. The Core Voltage is autodetected, arrgh. This ain't an OCer's board. It does do a lot for ~$92!
A new economy champ has joined the fray. The Iwill KD266. This mainboard sports the ALi MaGik1 chipset. This chipset lags behind the Via KT133A--but not by a lot. New drivers will close the gap farther. The beauty is that this puppy uses only SDRAM. It has no on-board sound or Vid, and sports an AGP 4x slot. It is overclocker friendly. I found it listed on Pricewatch, for ~$89. Not many e/retailers have this mobo yet. I know that I'm gonna get one. It's also ATX form factor, albeit it's a small mainboard. The Asus A7S-VM is full-sized Micro-ATX.