I use the manual inflatable from WestMarine. We used them for catarmaran sailing, and the auto inflates would go off too easily. Same on bigger boats when going forward to set an anchor in rough seas. I got mine on sale when they were $79.
I believe that USCG or FL (my area) laws are something to the effect that having an inflatable only counts as PFD when wearing them, as opposed to having non-inflatables where they only have to be on board.