The best budget socket A board out there, and currently the best selling mainboard of any kind here in Germany is the ECS K7VZA.
Get revision 3 of it for 133 MHz FSB support (266 if you like to double the figures for DDR busses ...). The board has just the basics, 5 PCI, an AGP 4x and an AMR slot, onboard sound coming from the VIA 686B chip, and nothing else.
No overclocking fiddly bits on it - but with the money saved, you'll easily be able to buy a higher speed grade Athlon to start with ...
regards, Peter