I'm helping a young man who wants to buy a dualsport bike for 50/50 riding. He is looking at DRZ400 S models - Early 2000's. Today he looked at 2000 model S. Main mods - It had a Leo Vince exhaust, professional suspension upgrade (racetech or similar), bigger plastic tank. No steering stabilizer. The motor and suspension felt good. But the bike looked ridden hard in dirt. What are bikes like this worth? IE what should he be paying? Thanks for suggestions.