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K2 Extremes are really versatile and you can use them where ever, when ever you want. Ive only heard good things from the Extreme. On the stiffer side of flex, similar to the old PE but way lighter.
As far as the STL goes, ive heard some good, and some bad. They are also pretty stiff, and good all mtn performers.
The anthems are more versatile between those and the invaders, the anthems are 93mm under the waist which will help you when it comes to jumps and such, but both of the LINE skis are really buttery. not as stiff at all compared to the K2 and the 4FRNT.