The Democrats would pick up Pennsylvania and probably Ohio, as both of those victories had a lot to do with the local candidates (very strong Democrats and very weak Republicans).
I see the same out come also, however I think the Dems would have picked MT up also. I think think Chafee, Talent, and Allen would have survived also. However, I could see the Republicans flipping at least three seats also, I think the Republicans could have defeated Bob Menendez in New Jersey, and I think Steele could have very well pulled it off in Maryland since Ehrlich most likely would have won reelection over O'Malley or any other candidate's the Democrats could have fielded. I could possibly see the Republicans picking up Washington and/or Florida(with a different candidate against Bill Nelson)
The House and Gubernatorial races would have been complicated with both parties gaining and trading losses.