If you like Cirque du Soleil, and even remotely like The Beatles, You'll love LOVE! I am going to LV next week and am considering seeing it again. Other than that, I a anxious to hear what recs you get.
My favorites are O, Mystere, and Love (in that order), all by Cirque du Soleil. The way they use the stage in O is amazing, Mystere is just whimsical and fun, and Love is great for the music.
We've seen Mystere and Ka, and loved them both. The next time we go, we plan on seeing O. On a side note, I did see David Copperfield years ago when he toured and we LOVED it, though haven't seen him in LV... yet