Joined: Nov 2007
Posts: 3,549
Likes: 1
From: Somewhere between heaven and hell
Bikes: '09 Jamis Komodo, '09 Mirraco Blend One, '08 Cervelo P2C, '08 Specialized Ruby Elite, '07 Yeti AS-R SL, '07 DMR Drone
Rock Shox Argyle
Marzocchi Dirt Jumper
Couple different versions of each, and one of the Argyles is an air fork. If you're light and/or smooth, you could get away with something lighter, like a Fox F80 or something. I haven't ridden a SID, but I hear it's a little on the noodle-y side. It's a really light XC fork, but then again, so is the F80, so I don't know.
You just want something a little more responsive and lower travel for jumping. If it's exclusively a jump bike, you can probably get rid of some of the gears too, but obviously that's a preference thing.
I have no idea how much that fork would go for.