I don't know a LOT about the PEs... If you are 5'2', you could prolly get the 160s, but that is just my opinion.  Depends entirely on how much you plan to grow, and if you slide rails and all that too.  But it IS late in the season...If you were to get the 170s this late, then you would ski them a couple times, and maybe they would be too long.  But next year, if you figure you are gonna ba like 5'6' or so, then go for it.
We'll have you dead pretty soon.