yeah dude, you're too heavy for 170 cm. i'd say something around 180. But we need to know what you'd like to ski the most. Do you wanna ski mostly park, powder, or just a little bit of everything over the mountain. Each ski is made differently depending on what you want it for. We need that info to help you.
And i don't wanna break your heart here man, but fuck those ski boards. They're dangerous, look really stupid, and they'll really ruin your ski technique. Stick to skis, you'll be able to ride more stuff, and you'll actually become a good skier. Dude on this site, anyone who skiboads gets torn up like no other, just a bit of advice.
king skiing preppy again since 1999.
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Just sign up for a credit card and if you don't wanna deal with it, destroy it when you get it. You won't have to spend a penny.