Hi Tara,
you might be wise to put up a post on the "Say hello" board when you have researched a few options, with details and prices and see if you can get a couple of others to go with you to a show and book now, rather than waiting till you get there. I didn't do any research beforehand, thinking I'd wait and see what others were doing and I didn't really know what else was on offer. When I got to Vegas and heard about the Cirque de Soleil shows like "Love" or "O" etc I would have really liked to seen one of them, but they were all booked out - and that was in March, low season! Having said that a gang of us saw the in-house show at the Stratosphere, tribute acts show like Lady Gaga and Michael Jackson and it was very good (and cheap!)
Best wishes,
Bob