I have a 2004 iron horse sgs pro freeride. I'd like to make it more of a downhill bike and possibly worthy of racing in beginner/sport class. I don't know if I should just upgrade the fork. Right now it has a sherman breakout with 6" of TPC travel. Should I replace it with say a marzocchi 888 or a sherman slider. Or should i just wait it out with the bike i have now and purchase a new bike?