Manduca. They had a stand at the baby & toddler show in Bluewater last week. He likes it because it comes in plain colours and has a nifty zippy section to extend the back as baby grows. The man selling it talked technical gumph to him so he was well impressed!
I already have a connecta and a beco butterfly II but he didn't really get on with either of them - DS was too old to carry comfortably in the connecta by the time he was ok with doing it (though I love it) and the beco has a fiddly inner harness and the straps just kept slipping off his shoulders all the time.
If he does decide the Manduca is the one for him (we're going to hire one first) then I shall sell the beco.
You wouldn't get him wrapping for any money!