As for the final five, I'm going to be the first to suggest that Cleveland and Mckinley may be dark horses.
Do we need to vote Grover off twice?
This round, FDR v. Bush, is the first truly partisan round. LBJ is legitimately despised as President by many of us. FDR's domestic fiscal policies may not be well liked, but he did deal with WWII properly. I would imagine many of the people voting FDR off are looking to get rid of him in retaliation for the run on Bush.
Really, no one can judge W, Bubba, and Bush the Elder in a proper historical context at this point. In 20 years we may live in a world where International Terrorism is all but forgotten and democracy in the Middle East is the accepted norm. We are just now beginning to enter the phase where we can properly judge Reagan.