Las Vegas
Vegas is a great place to visit and you better get there before the fun is out from the planning. The Hotels in Las Vegas are definitely pretty expensive, but you can find hotels a little far from the strip but close enough to enjoy the fun. ( More info in the visit las vegas guide )
The hotels in Vegas make their money from the gambling activities going on in their hotel. The public transport system in Vegas is pretty good, the taxis are not that expensive and buses are available at all times. This removes the need to rent expensive cars which kill your budget.
Las Vegas is a Fun place, you can go there with your family or even your wife/husband. It is even a good place to get married. So get going, put on your tough to judge poker face and go there!