Nationwide, a GOP net gain of 7-10 isn't an overly optimistic expectation.
In the Senate, the Democrats are defending far more seats than we are, which should equate to a net gain of at least one seat. Although Keyes has little chance of holding Illinois for the GOP, we'll pick up Zell Miller's seat for sure and probably Foghorn Leghorn's seat in South Carolina. Mel Martinez would probably carry Florida if he is the winner of the primary.
DG, I think we will break even in the Senate, though we are in a better position to gain one or two than they are. I expect to get FL GA and SC but lose CO IL and Alaska. We screwed up IL and Alaska without any help. We MIGHT hold either CO or Alaska, and I think the rest will stay as they are.