To address the question about what year. YZ 250's changed from 01 to 02. 99-01's are good bikes, with a poor kickstarter lever. I know, I have an 00 and 01. I personally don't know the difference between an 02 and 03, but newer is generally better. With all that being said, the one that becomes available in the best shape for the money you have, is the best one for you at that time. Search through this site and read what people say about the 2stroke/4stroke thing and comments on the various years. Also, search on how to buy a used bike and the things to look for, such as, worn suspension and air filter condition.