1.) LOVE - It's an incredible show, in a wonderful, comfortable theater. Prices are reasonable for a top-tier show and souvenier/concession prices were surprisingly reasonable as well. I've seen it twice and I can't WAIT to go back for a 3rd. Simply amazing.
2.) Mac King Comedy Magic Show. - Afternoon show that is a great value and tons of fun! He really does a great job!
3.) Elton John - The Red Piano. He's such a wonderful performer and seeing him live is such a treat. He's funny and makes a special effort to work the crowd. The videos that go along with the songs are so mesmerizing I kept forgetting Elton was there!
4.) Jubilee! It's kitchy and campy and topless, but it's just so quintessentially Vegas. Everyone should do it once. Spend the extra $10 and take the backstage tour--it's really fascinating.
5.) Comedy Stop at Tropicana. 8pm show is non-smoking. 3 comedians per night, and it's rumored that they pay better than the other casinos, and therefore get better talent.
Honorable Mention:
KA, Lance Burton, Poolside concerts at Mandalay Bay, Mamma Mia, Second City, Dueling Pianos @ NYNY, Star Trek Experience
DIShonorable Mention: Viva Las Vegas at the Stratosphere (at free, it was still overpriced!), The Price is Right Live! (surprisingly dull), Magic of Rick Thomas (Interesting for a while, but he lost me when he started dancing around with a pole with a wig on it. Better magic can be had for not much more money.)