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need a mobo that supports c2duo, ddr1 and agp

You are better off with the 775Dual-VSTA - it will give you better overclocks. 10% should be attainable, but not much beyond that.
 
In theory you will see a much larger OC with the E4300 thanks to its 800MHz base FSB. Now that the E4300 is available, you should be able to get much better OCs out of the board. Max stable is usually around 1200MHz FSB, so we're talking upwards of a 50% OC in an ideal world. Of course I havent tested an E4300 in the board, so ymmv, but I would definitely go for the E4300.
 
Since the AsRock can't reach very high FSB speeds, the E4300 would be best since it has a higher stock multiplier. Its stock settings are 9*200=1.8Ghz. So raise the FSB to around 300 (the asrock's max), and you'll get 9*300=2.7Ghz. The stock intel HSF should be fine for such an OC.
 
I believe there were a few rudimentary dividers in the BIOS that worked with DDR I, but don't hold me to that as I didn't use them when OCing my Dual-VSTA system. For some reason i get the inkling that you can lock the memory to DDR400 if you so please, but again, dont quote me on that, may want to check out the thread dealing with this board in the motherboards forum for more info - its a beast of a thread but contains some good nuggets of information.
 
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