There are so many good shows, but I have to agree with Jubilee, simply because many shows, including the headliners, can be seen elsewhere in the US. Jubilee is Vegas, considered cornball by some but we loved it...good musical acts, multiple costume/act changes, very fun, not expensive.
There is also one called Vegas the Show, or something like that, which has gotten real good reviews, apparently a similar show, Vegas themed, retro stuff. LVA gave it a very good review, I think.
Would suggest one of the two.