Replying to Debating between skis (watch life or invader)

Okay I know everyone hates reading these, but I'd like some other opinions....
Im 6' and 160. I live in the northeast and ski 80/20 park/all mtn. Right now I have Atomic Thugs for soft snow days/days when I know I won't be in the park. I'm on k2 silencers for the park days. The silencers are now completely beat, and I'm looking for a new park ski. My question is basically between 178 09 Invaders or 180 09 Surface Watch Lifes. I'm on a limited budget here, and I'm not really looking to spend more than about $250. I can get the Surfaces for quite a bit less than the Lines, and I've rarely read anything bad about the 09 Watch Lifes as a park ski. I'd also like to support a company like Surface, and I've heard great things about their warranties, etc.... that being said, I know the Watch Life is a stiffer, more all-mtn. oriented ski. Can anyone compare the flex of maybe the silencers and Watch Lifes, and would a ski like the Invader perform drastically better in the park? Is this outweighed by the fact that the Surfaces are a higher-end ski? For the record, I mostly stick to rails and smaller jumps (20-30').