Just my own personal opinion but you absolutely must get some 80's or 90's era skis. they should cost about $10 or so if you can find them before they get thrown out. The main reason is that modern skis have enormous ski cut and turn great, which is great for going downhill. Old skis have no sidecut and they pretty much go straight really good. Now the reason this is so good for snow kiting is that most of the time you are on edge, the kite is pulling you sideways and having that straight ski just makes everything so much easier. A modern ski always wants to pull you left or right and you are always fighting both it and the kite. This is for ordinary conditions where you have packed snow, crusty snow, light snow, any of the typical garbage snow conditions, those old straight skis are great.
But sometimes you have a big POW day. In this case, put away your old skis and bust out the snowboard, and carve to your heart's content. Anyone who skis can learn to snowboard it's not that hard especially on a kite. If you really don't want to use your snowboard on a powder day then yeah get a modern ski but no matter what never use your downhill skis while kiteboarding, as kiting puts too much abuse on your skis.
I have 2 sets of skis 2 snowboards 1 iceboard.
I used to have 2 iceboards but added some hockey blades to one of my snowboards and it is better than an iceboard to be honest, but you need 2 blades one near the toe one near the heel, 1 blade in the middle doesn't work right.
You never know what kind of winter you will have it's like a box of chocolates. I wouldn't bother buying anything until the season arrives some years you never get both snow and wind at the same time and it's a bust. Other years you ride every day.
Which by the way is why all those ski resorts force everyone to buy their lift tickets in advance. It's because if they don't charge you 300% more (and sometimes not even letting you in at all) for buying your ticket on the spot a lot of people would never go. Some years it's just a bust. it's so dependent on mother nature. They force you to buy months in advance before you know how the conditions will be in the mountains. Lift ticket prices get me so mad. I don't want to buy that stuff in advance! What if there's no snow? anyway, the good thing about snow kiting is you don't have to buy anything at all and just wait until there's a big dump, good wind go buy some gear and have some fun that's what I would do wait until the snow kiting season is actually here.
I think total cost of all the gear shown is about $200. $10 for the skis $30 for the snowboards, $100 for the skateboard, then about $50 in parts to fix everything up. I will drop a few hundreds on my boots though, you got to make sure you got a boot that fits right. You don't want no skanky used up old boot you want a modern decent boot.
Oh one last thing I pad it up helmet elbow knees hip sometimes wrist guards. Without pads that's no way you are going to boost as the crashes are so hard. One hard landing on your knees is season over without pads.