Miami arena is biggest venue ever for show.

Rapper Jay-Z leads the field for the 2004 MTV Video Music Awards, with six nominations for "99 Problems." OutKast, No Doubt and Beyoncé are right behind with five nods each.

This year's show will mark a number of firsts for the VMAs. The Aug. 29 event will take place not as before in New York or Los Angeles, but at Miami's AmericanAirlines Arena. It's the biggest venue ever for the gala, which in previous years has been a theater affair. Additionally, there will be no host for the show, which will be broadcast live in the East and tape-delayed for the West Coast.

Among the first round of acts confirmed to perform are Usher, Kanye West, Jessica Simpson, Hoobastank, Yellowcard and Jet. MTV/MTV2 president Van Toffler tells Billboard.biz the event might be the most expensive staging ever for a VMA show; he declined to reveal details.

"99 Problems" will battle OutKast's "Hey Ya!," D-12's "My Band," Britney Spears' "Toxic" and Usher's "Yeah!" (featuring Lil' Jon and Ludacris) for video of the year. Nominees for best group video are No Doubt's "It's My Life," D-12's "My Band," Hoobastank's "The Reason," Maroon 5's "This Love" and Good Charlotte's "Hold On."

"Toxic "and "Yeah!" will battle for best dance video against the Black Eyed Peas' "Hey Mama," Beyoncé's "Naughty Girl" and Missy Elliott's "I'm Really Hot." Nominees for best rock video are the Darkness' "I Believe in a Thing Called Love," Evanescence's "My Immortal," Hoobastank's "The Reason," Linkin Park's "Breaking the Habit" and Jet's "Are You Gonna Be My Girl?"

Up for Breakthrough Video are Franz Ferdinand's "Take Me Out," Kanye West's "All Falls Down," White Stripes' "The Hardest Button to Button," Modest Mouse's "Float On," New Found Glory's "All Downhill From Here" and Steriogram's "Walkie Talkie Man."

In another first, the Viewer's Choice Award will be determined via head-to-head voting matchups on MTV.com, whittling down a field of 40 clips to five.

MTV2 viewers will select the winner of the MTV2 Award from "Take Me Out," "Float On," the Yeah Yeah Yeahs' "Maps," Elephant Man's "Pon De River," Yellowcard's "Ocean Avenue" and Twista's "Slow Jamz" (featuring Kanye West and Jamie Foxx).