I currently own a JD 9120 and am thinking of trading up to a 9230. There seems to be a pretty steep price increase. The tractors seem pretty much the same, what am I gaining in the trade? Also the current 9360R is another steep jump in price. From the standpoint of dragging the same equipment around the field, how can one justify the price increases. Seems like these increases would be good for used tractor sales. Also, where could one find the repair histories on the 9120 compared to the 9230. For some reason there are a lot of 9230 tractors for sale on fastline and few 9120 tractors for sale. Is there a problem with the 9230's?