looking at bikepedia the fork length is 80/100mm depending on frame size... can't tell for sure but looks like you're set to 100mm... but I could be wrong...

if it is 100mm you'll want a taller fork then if you have an 80mm (20mm shorter duh)... basically you want to have the same axle to crown height as your fork is stock at sag height... shorter will quicken the handling, taller will slow it down... theres also the factor of the rake... more offset will yeild quicker handling (how fisher's G2 geomotry managed to feel fairly quick with such slack steering angles)... to add to things that you didn't ask.... you can run a g2 fork on a normal bike with more travel and have it handle similar to the shorter stock setup (i'm takling 29ers here as thats what I know)... I run a 29er karate monkey with a g2 tora fork set to 100mm... similar handling to the 80mm rigid... just squishier and a bit more upright with a smidge more bb height...

so basicly just make sure your new fork is about the same length as your current fork sagged...

good luck man
mark