I've always loved the Beatles.. we watched Across the Universe before going for Love - made the experience that much more fun!
Love is SPECTACULAR. Of all the Cirques I've seen, this was the most unique in that it offered an additional sensory experience for the show-goers. Keep your eyes, ears, and nose wide open... and make sure you have a place to rest your margarita glass if you buy one for the show!
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If I could do it all over again, I'd save the best for last and do it in the following order: 1.) Zumanity, 2.) Mystere 3.) Love, 4.) Ka, 5.) Le Reve, 6.) O - Haven't seen Elvis or Believe, but I'd bet they'd go well either before/after Love.