Ok, I'm 15 so I don't have a job and I have about 600$ and my parents will lend me money. I can get Marlin disc for 600$, a Trek 6000 disc for 640$, and a Trek 6500 disc for 800$. I don't make a very big allowance so it would take me awhile to pay off 200$ (don't forget tax) and I have a helmet, gloves, camelback, etc. I ride single track, which one should I get? I'm leaning to the 6000.