Is it worth it? (Help Me)

Hey, important question for anyone who can help me. I own a pair of skis that are 170 cm long and the underfoot is 83mm. They are excellent for groomers and park for me because I am 5'7" and I am an inch taller than them. I want to buy some buttery powder skis them totally rock in pow but I still want them to be able to ski groomers and park when necessary. Would a pair of 178 skis be too long? Would they be fat enough because they have an 98mm underfoot and that is only 1.5 cm wider. If they aren't the best option for me than what would be better?
Please help me with my dilemma because it might be too late to decide soon... Thanks
 
I've been thinking about getting Lizzie's instead but I will be growing quite a bit soon and can get a good deal on these other ones...Thanks for the advice though....
 
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