How much under $1000 is that Cannondale? Around $1000 doesn't seem like an especially good deal for a 2007 leftover with mostly Tiagra parts. You can get a 2009 (or now 2010) Kona Jake with Tiagra stuff for $900.

If you've got as Performance Bike store near you, you can get a Fuji Cross Comp with 105/Ultegra drive train for just under $1000 right now.