hmmm i really would stay away from a slotA board then (unlike slot1 there is no adapter to convert slota-socketa)
yeah durons are very cheap and very overclockable
as for boards if you want something not to expensive but good for overclocking and nice and stable i really like the epox 8kta3 (around $90) this uses pc133 ram
if you want to spend more and still stay with pc133 ram you might want to look at the iwill kk266 or the asus a7v133, both are good boards and will cost between $110 and $120
if you want to go even a little higher you can get one of the new ddr board (you would have to buy new ddr ram,
www.crucial.com has 256mb of ddr for about $60)
in that case i would say get the epox 8k7a or gigabyte ga-7dx they are around $130-$140
the price are from
www.newegg.com (one of the best online places to buy pc stuff)