Sorry to hear that. I see this way too often though...
Check out this solution
http://www.youtube.com/watch?v=HK9cXijBnRc

http://cgi.ebay.com/ebaymotors/2000-2002-Saturn-SL2-intake-manifold-part-_W0QQcmdZViewItemQQhashZitem1e5bc99c9dQQitemZ130388958365QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

This is a common problem that will cause check engine lights and misfires. He's probably right. Just have him show you proof of the crack before you pay for a new intake. There's been some times where all you need is just a gasket.