1: Dont worry about the base technology, they are all similar with a good wax job
2: if you know how to ollie properly on a snowboard you should have no problem on a reverse camber or camber board
3: a good camber board floats pow just as good as a rocker, rocker is just more loose, but they way dc does their rocker its not straight up V flat between bindings and the rocker is outside of the bindings
4: i'd go with the DC PBJ if i were you, it'll be a great board for park, soft forgiving, Great for jibs and !
5: Any board can ride pow, you can have a board the with all the tech is supposed to make you shred pow easier and it can suck, just gotta know how to ride your board.
p.s. dont over think getting a board, dont go for graphics you might end up getting something you dont like how it rides. and dont get to heavy into studying all the tech in the catalogues, go to your shop and check out some boards they have there, flex em, look down the sidecut and the camber or rocker it has, and get a feel for which ones you like and go from there. If your hyped cuz its got camber and its super soft, look for a board like that or pick that one up!