The only thing I see on newegg with your chipset are some Zotac mirco ATX motherboards, they are very reasonably priced. I have no experience with brand so can't really speak to how good they are. If you're not limited to that chipset there are still a lot of offerings on newegg for LGA 775.
ok the p5n-mx i found were $350. The Zotac sold out now. Got anything else?...also I just found out what happened to the mobo, a capacitor was pulled off. (a friends roommate trying to ruin the comp). I don't know much about mobos...Is that an easier fix?