Ribstogo12

I bought a 2005 Kona Stuff with the intent of trail riding and dirt jumping. Two years later I'm looking for another fork. Currently I have a 2005 Marzocchi Dropoff-comp, and want to upgrade to a 2007 Marzocchi Dirt Jumper 3. I was wondering if the suspention improvment would be worth the money I would spend on the fork. I found someone in town selling a Dirt Jumper 3 100mm for $120. Will I see more improvment with another fork, or is the 2007 Dirt Jumper 3 my next fork?

Thanks!