NAMES Jon Heder, Efren Ramirez, Tina Majorino AGES 27, 21, 19 HOMETOWNS Salem Ore.; Los Angeles; Thousand Oaks, Calif. THEIR BREAKOUT MOMENT Leading the lovable cast of the nerd-empowerment comedy Napoleon Dynamite an ultralow-budget (estimated at $400,000) indie that grossed $43 million. ON SPAWNING CUSS-FREE CATCHPHRASES While playing Xbox Live online, recalls Heder (Napoleon's titular Übergeek), he heard one young opponent yell, ''Gosh!'' ''I said, 'What?' He said, 'I'm quoting my favorite movie.' I told him who I was; now I'm gonna have all these invites to be online buddies. Crap.'' FIRST MAJOR PURCHASE When Ramirez (who plays student-body-prez wannabe Pedro) had to choose between offers from no-budget Napoleon or big-money bomb The Alamo, his father urged him to ''follow his heart.'' After Napoleon hit big, he chipped in with his four brothers to buy their dad a house. ALL GROWN UP This was the first role for Majorino (Napoleon's side-ponytailed crush, Deb), the young costar of the 1994 drama Corrina, Corrina, since taking a self-imposed five-year acting break. ''I didn't want to experience my first kiss on screen,'' she says. WHAT'S NEXT Heder will star with Reese Witherspoon as a goofy occult expert in the romantic comedy Just Like Heaven; Ramirez appears in the upcoming Brad Pitt-Angelina Jolie spy caper Mr. and Mrs. Smith; Majorino continues her recurring role on UPN's Veronica Mars.