Replying to Invaders/STL or THalls

Im 5'7"
140lbs
ski park 100%

I was thinking towards three skis, also suggested sizes would help,

!!! ~ This will be my ONE and ONLY ski, ~ !!!

Invaders ~
My friend has these and loves them, but he washes out a ton, he can butter like crazy though. And i would love to buy a pair just i want to know if they're stable enough , also his skis are like beat up as hell and only from a half season.. are these durable enough for east coast ice and hard packed like all the time.

STL ~
Love the design, friend has em and loves em to death. Almost SAC'd em last weekend but missed em and now im thinking, he says there very soft poppy yet stable. he also says that they're extremely nice on rails and he skis rails every day for whole season and bases are nice. But they're delaming a tiny bit. im also worried if 167 would be too big for me.

THalls ~
these skis sound awesome, light poppy, flexy and durable. I've seen some people with them and they all have had no complaints besides durability. The one tihng im worried about is that the price is giant for these and i cant find them for that cheap, and i want to make sure i get my money worth.

Thanks for the help