I think invisibility would be an awesome super power to have. Especially if it included intangibility, aka "phasing." One could do ANYTHING being invisible. Rob banks, frighten/torment the religious with delusions of ghosts, be the ultimate ninja.
Shapeshifting would be a close second for me though. You wouldnt have to completely sacrifice sex, being that you can just change into having a sexual organ, plus you could be anyone. Go to the beach as Kelly Slater, get some free surf boards and pussy, go to a record store as Bob Dylan, go to a third world country as angelina jolie and get some free children. I mean, the possibilities are endless.
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