Replying to O7 Invaders, or O7 Silencers...That is the question

Hey I am supposed to be recieving warranty replacements on my last years invaders... I just got informed that I can upgrade to 07's for 50 bucks, or probably get anything else in stock for the same price...about the only others i am considering are the silencers, or fischer addicts...has anyone had any real experience with either the fischers or k2's to be able to persuade me...I dont mind line skis...but that havent impressed me lately and im beginning to think i should get away from them...I rode the first gen. PEs like two years ago and thought that they were just ok...What should I do?