I'm guessing that a Republican takeover of Congress would lead to Senate Majority Leader Mitch McConnell and House Speaker John Boehner. But according to Public Policy Polling, that would disappoint a lot of Republicans:

Usually it's the party that loses power whose voters want to clean house. The fact that GOP voters want new leaders even if they have a highly successful election cycle speaks to the disconnect between the voters fueling the Republicans' momentum this year and the party higher ups in Washington DC.

Only 21% of Republicans think the party should retain its current Congressional leadership if the party gains control with 57% saying it should be replaced.

When to comes to John Boehner and Mitch McConnell in particular the Republican base isn't too impressed either. Just 33% want Boehner to become Speaker with 34% saying it should be someone else and 33% unsure. For McConnell the numbers are even worse. Only 27% would like to see him as Majority Leader with 33% definitively wanting someone else and 40% not sure.