Don't go with the abit...the nforce4 was not meant for the conroes and don't oc worth nothing. If i had to chose from those mobos, id go with the gigabyte s3 for the best ocing board.
Can you push for the gigabyte ds3
, its the best budget ocing mobo for the conroes. Im not sure on the price though, because on the list of mobos it listed for 129.99, but when you click on it for details it is $135??? If you can push for it, might want to ask newegg whats the real price.
edit: nvm newegg fixed it...its $135 but it is well worth it if you want to oc the conroes.