We've been to Las Vegas several times before but we are taking our 3 college age sons with us in December (X-mas week) and would love to have an insider's recommendations for dining. Price is not an object but we are seeking fine food with a lovely or fun/hip atmosphere. Formal is fine just not stuffy. We like Italian, steak, french,asian....We are staying at Bellagio but can travel. Choices we are considering are Nine, Mix, Prime, Nove, Tao. Any other suggestions? Thanks in advance!