hehe, as Ms.Sumomo knows, I did go check out Duke's in Malibu for my wedding. They have a private room with its own entrance to fit up to 250 people (although that would be a bit cramped, but with your numbers it would be nice), lunch is under $30, dinner is about $40-60, nice view of the Pacific Ocean (no beach access though). However, we did visit it on 2/23 and while it was sunny in the afternoon, it did start to rain a bit when we left. You never know with the weather in Feb.
With a lot of people traveling from overseas though, I would think Vegas would be a bit more accommodating than LA. It's smaller in size, there are tons of attractions within walking distance, it'd be easier to get around, and there are lots of hotels to fit anyone's budget. But I don't know how it much it would be for a wedding, just depends on what you want. haha, you have a better budget than me - I'm thinking $15-20K for 200 people. HTH!