Replying to Binding help

ok so i broke my ar5s (well not really broke...but ripped like a foot and a half long piece of edge out on one side...and a 6 inch piece out on the other side..pretty much cant turn any more)

so i ordered some line invaders tonight 178cm...i'm tall 6'3...i weigh 170 pounds...and ski park heavily, pretty much 100%...i don't have a ton of money to throw down so i have two options....

Rossi Scratch 100s
http://www.porterstahoe.com/istar.asp?a=6&id=P8280!ROSSI
Price: 100$

or


Look PX
http://www.porterstahoe.com/istar.asp?a=6&id=C8460!LOOK
Price: 140$


is there a huge difference in the two? if there isn't i'm going to scratches...but if my weight and my park skiing would cause ejections and such...i'll go the PX...just looking for some help.