Don't be too alarmed by the valve comments. How and how much did the original owner ride? If he didn't race and was conscientious about cleaning the air filter and changing the oil, the head is probably fine. Many of the YZFs get hundreds of hours out of a set of valves. They are noted for their reliability, compared to the other Japanese makes.
Consider spending some money on getting the forks revalved. Stock, they can be a bit harsh compared to newer bikes. I don't go very fast, but I sent mine to Smart Performance for some attention and am pleased with how they turned out. My awkward landings are much more comfortable now.