You're going to have a great time!! I had mine in Vegas back in January. There are a TON of great deals out there on hotels right now for the time that you are looking to go.
There were maybe 6 or us but I do have friends in Vegas, so that sometimes increased depending on what we were doing. In some ways, it was easier when it was a smaller group though, as there are less opinions!!
I do STRONGLY suggest you get tickets to Stripper 101. It was really fun.