I'll be taking lessons in January on Sanibel Island. I'm putting together a quiver of gear that me, my dad, and my girlfriend can all progress on after our lessons. I'm trying to strike a balance between gear that would be usable for my dad and gf on this two week trip, with gear that I will want for myself in the future.
I can go in lighter wind, when i'm on Bigger boards ;
that be said, then so should You and your girlfriend.
I'd get a nice stable Wide but short directional for your dad ; then
when the wind is on the Light-side ----> you & the girlfriend can use it.
You could even bolt down a 60cm race-fin to it & go up-wind like hell
in almost no wind at Your weight !!
Other-wise, everyone is on a TT of there own size & choosing.
I started Kiting almost 9 years ago now, and I dedicated an entire year to learn
to ride a directional on a F-n Lake. The Only Bummer is that i should-a learned that thing
right from the start, instead of a year ago, -- ((because it's SO0oo fricken Fun)) -- !!!