The Terminator Omnibus Volume I includes Terminator Tempest, One Shot, Secondary Objectives, and The Enemy Within. It will be available in retail stores everywhere February 20, 2008 with an SRP of $24.95. The Terminator Omnibus Volume II will follow on March 26.
I would have to rummage through the DrawerBoxes to find those issues, but I seem to remember a couple of the series were pretty good. With Omnibus editions of Aliens, Predator, Indiana Jones, and now Terminator making the Omnibus collections, you can bet the entire 1990s catalog will make it to Omnibus shelves soon.