There are two 250's with the style you are looking for. Of course, the Ninja 250 and the Honda cbr250. The Ninja sells for $4600 new and Honda sells for $3,999 new. But, if you are looking for used don't limit your search to 250's. The 500cc sportbike is also good for a beginner. There are many motorcycles that you can get used for less than $2000. The $1000 bikes take a better sense of mechanics in order to get a good deal. But, generally, if it starts, runs, stops, and restarts warm it will be a good bike.