not enough info - key is how heavy you are, how heavy the folks in ur fam are, def how old you are so we know how much ur likely to grow.
are these skies just for a season or two or are they gunna have to last the next five.
then, are u planning to centre mount
how strong a park skier are you
what length were your foils and how comfortable were they to spin.
generally if ur growing, start with the longest ski u can, but more info would help.
I used to have the tre` duce
And the duce duce in my bubblegoose
Now i got the mack in my knapsack