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Welcome to ns and i would definitely buy some skis even if youre younger because you can always resell them. Look in the Buy/Sell/Trade forum for a used pair of park skis in decent condition, if not buy an older model park ski online or from a shop. I would suggest around 170 cm and above so theyll be useable for a few years.
Armadas will be a better all around ski IMO, Invaders are good park skis but Armada Ar6s and T-Halls are much better for riding around the mountain. I ride ar6s and theyre a great lightweight ski that I can still ski on groomers pretty well. Look for any year ar6s because they really havent changed much over the years other than topsheet, I'm 5'10" and ride 176s and theyre great but I'd suggest a 171 for you, after a day or two the longer length won't bother you but actually help you land easier. Check ebay, the buy/sell/trade forum here on NS and google for the skis