Im about your same size probably, go for at least the 178 dude, and if your skiing park, DONT let the people who are mounting your skis try to talk you into mounting them far back just because your a beginner.....no farther back than -2, i would go center mount. you'll regret it if you get them mounted way back, its not as easy to set spins off rails/jumps.
And longer skis are more stable, at high speeds and landings off jumps....and it looks kinda dumb when your rocking incredibly short skis for your hieght.
If your looking for a jump ski go stiffer/ rail ski you can go for both....softer for buttery fun
-Vokl wall is a good ski for your size....size 177cm or if your want 185cm
-Armada T-Hall: go for size 181cm
-Moment Rocker: Not as easy to catch edges due to the rocker on the shape of the ski
- Line Chronic: Stiffer jump ski
^^^^^all legit companies, and good luck bro...