probably around 700 for the room including taxes depending on when you stay. Probably 1500 total for food depending on where and how much you eat. Airfare is hard to say it depends on where you are....I would estimate 400 each roundtrip to be safe but that might be a lot more than it really is. I don't know how much Universal tickets are (if that is your plan).
So you are looking at somewhere around 3800 for your airfare, room, and food. As far as tickets and others I don't know.....
Sounds like 5000 is a good number, in my opinion.