I would recomend you dont overclock right now
This is what I Can recomend, fitting around your needs (I'll recomend a mobo that is typically good for overclocking if you chose)
AMD Athlon 1Ghtz Thunderbird - 131$
Asus A7V (Best motherboard, for stability and performance) - 102$
about 256 Megs of PC133 memory - 42$
if you are going to get a Tbird, dont use the 250Watt Powersupply, get a good 300 or 350 watt sparkle powersupply from Monarchcomputer.com, typically 40$ very clean power.
but all in all, check pricewatch.com for prices, check socketa.com for motherboard reviews.
I personally like Asus A7V it is a real good performer, has four IDE Channels (2 for ATA/100 , 2 for all others), etc.
The Soyo K7VTA-B (which is what I am currently using as a replacement since I blew up my duron 800 from O/C) , seems to be a good board, it only got 8/10 where as the Asus A7V got 10/10 , the reason the soyo looks good is that you can modify it's multipler with the jumpers, you can do the same on the Asus as long as you dont get the one with onboard sound.
but what I am recomending you is a
Tbird 1Ghtz 200FSB
Asus A7V
256-512Meg PC133
Sparkle 300/350 Watt PSU
you can get the 266 FSB 1Ghtz if you want, the Asus Supports it, although I dont know how much greater performance it gives.
Stay away from the DDR boards for now, none of the chipsets (AMD 750, AliMagik, KT266) seem to have more than 5% performance over boards that use PC133.
while you are looking at pricewatch.com, look at resellerratings.com to be sure you are buying from a company that wont give you such a hassle (like bad shipping, poor salespeople, etc) Karl Blessing aka kb244{fastHACK}