I'll scrap your plan right there if thats the way your looking at going. A zone is never better then what your weakest player is. So if you got a bad defender somewhere in it your opponent will find that player and play around him all game long.
If your going to use a zone you will have to make sure you have got three high OD players defending outside.
If I could +100 a post, this would qualify.
If you run a 3-2 zone, and any one of the three guys defending the PG/SG/SF position have low OD, that player will be torched most of the time. (I would say always, but the random number generator sometimes does things like having guys projected for 96 PP100 shooting 0-11 through three quarters). It's more important to have three good outside defenders in the zone than in man to man - in M2M, if your opponent doesn't have a good outside shooter at SF, an SF with low OD may not be punished as much, but in the zone, he'll also defend the SG and PG at times, and those times are three point parties.