ive got a pair of 161 invaders 08, that im going to be using for 100% park. i weigh 135 and am 5'8" about. i cant figure out what binding i want between
Scratch the markers off the list. All of Marker's bindings besides the duke and jester suck for everything other than racing and carving. I'd recommend the px12's.
I second the PX 12 jib. Low mounting height, you won't pre-release very easily, and if you're skiing a 161 ski, chances are your DIN won't make it past the 12.
px 12 is a great binding that will probably never pre release but they are heavy even in titanium model. ive never skiied sth12 but z10 model is super light and would probably be fine for your weight. the head mojo11 is also super light and retails for 110 bucks but if you're looking for a more bomber light weight binding get the sth 12 or marker griffon - they are basically jesters with lighter parts and lower din