There are 3 things every offroad bikes:
1) Proper Jetting
2) Suspension set up for the rider & conditions
3) A steering damper
I am a HUGE fan of steering dampers. They make the bike feel much better, so you ride with more confidence, whether it is slow and rocky or high speed whoops.
You will also be able to 'save' lots of crashes, so think of it as a safety device. The last time my personal bike did not have a damper, I broke my collar bone.
Everytime I swap bikes with someone who doesn't have a damper, it is obvious how much difference it make.
Get a damper! You can probably swap it to your next bike, too, unlike most other mods that don't do as much but cost almost as much $$$.
Oh yea, a good front tire (like a Michelin S12) helps, too.