Carbone- Aria (Italian)
Bavettes- Steakhouse (Park Mgm)

runner up steakhouse is Prime (although you must ask for outside patio; then you can watch the bellagio fountain show every 15 minutes. This place would be most romantic)

best food overall Guy Savoy- Caesars Palace (French). Will break the bank, so know what you're getting into

Casual Dining: Yellowtail (bellagio), Momofuku, Hollsteins (cosmopolitan, burgers)