Washington for his establishment of two-terms and his hatred of the two-party system.
Jefferson for Louisiana Purchase and helping stop Federalists from taking over the country.
Madison for writing a bunch of good Federalist Papers.
Lincoln for being moderate. Or rather as moderate as he could be, circumstances considered.
Teddy Roosevelt for his awesome progressivism and trust-busting. Also for being all-around awesome. How many people can take a bullet and then give a speech the next hour?
FDR... he did what he had to do. Can't say I support all the New Deal stuff, but really I blame LBJ more for expanding them far beyond what FDR envisioned.
Eisenhower is probably my favorite, because he was everything a moderate should be. Helped build infrastructure (that doubled as national defense), balanced the budget, made peace in Korea, and was really close to making peace with the Soviet Union. Alas, the U2 incident happened.
Reagan... well, he was good. Not as great as conservatives claim, but he was pretty good. His foreign policy worked really well, and he got the military and economy functioning again. Deregulation's also good, although it may have led to the 2008 crash (although really that's still the banks' fault for overpricing houses and giving out bad loans).
EDIT: also please tell me you people actually understand a little bit about the presidents you vote for