Replying to Line invaders 08

I just got an offer for the 2008 invaders. I can buy them today... But i wonder:
* I only ski park, so they're perfect, rigth?
* I am 5,8 feet tall and will buy the 178 ain't that rigth (i will have them next year too)?
* Have there been many troubels with line skis since K2 bought LIne? Because I have to order them from far away, so I hope i don't have to send them back because of basic warranty problems....

Thanks for the help!