We had a Disney wedding for similar reasons that you did, although my wife's family is much larger than mine.
We had a separate banking account.
Think about a couple of things: How much can you afford to spend? What time of year do you want to have your wedding? (This chances the price in your wedding and can be pretty significant.) What day do you want to have your wedding? (We had ours on Friday, and that saved thousands by itself.)
As noted in my "One Year Later" thread, we had a number of things that cut into our savings, just because life happened to us. That being said, we were still able to afford the Disney wedding and our coordinators did a fantastic job with it.
So really it just depends on your situation. If you can afford a 30K wedding with 30-50 people you're going to have a great party, if you can only afford a little more than the minimum, you still will have a great time, although you probably won't be able to do some of the extras.