A stock good running 2000 model Warrior 350 would be worth that amount of money to me if I wanted one,,and I don't know what KBB is for it, but I don't pay much attention to that anyhow. I go more by condition and if it is the machine I want.
Top speed wise your talking around 55-60 mph,,maybe a little more. They aren't in the same league as a 400ex obviously, acceleration or speed wise. More on par with a 300 ex is the best way to describe it in that regard. But I wouldn't let me deter from purchasing a good solid machine. Just as an example, I had an old Polaris Sport 400l two stroke and rode with Warriors and 400ex's all the time and had just a good a time as they did. I was faster than the Warrior in acceleration and top speed and had a smoother ride than either machine with better ground clearance. I was quite even with the 400ex in acceleration and top speed in most conditions, but handed it to him trail riding,,was my machine better than a 400ex?? No way, just making a point of it's how you ride, and having good tires and a reliable machine that matters most as well as having fun.