For me, it would be a toss up between Harry Truman, JFK and Clinton.
Flame me all you want for Clinton I don't care. He didn't care to be involved in wars that we didn't need to be involved in. He did choose to have small military involvement in other countries but it had no effect on us like our current Middle East venture that's lasted, what 8 years now? Like it was mentioned before, the economy was slammin'!