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6. David Archuleta, Season 7

How Far Did He Go: Runner-up

Most Memorable Performance: John Lennon's "Imagine," which he reprised in the finale (and left out the line about "no religion").

Biggest Hit: "Crush," his debut single, sold two million copies worldwide.

Career: Idol's clean-cut, Mormon teen dream, he started his run at 17, as a budding pop star in the age of purity rings. Plus, he was part of the epic David vs. David showdown finale. Archuleta was the lesser of the Davids, according to voters, but has had a fine career nonetheless. Even a two-year hiatus in 2012 to serve as a Mormon missionary didn't slow down his fanbase, and he  returned to release two more albums in the U.S., and an additional album of Filipino covers, Forevermore.