I've been searching for a good ZTR for quite a while to use mowing my 4 acre yard. A have a family friend who has a 2003 ZD21 for sale. It was used privately for 8 years then the last 2 commercially. It has 1600+ hours. The owner said he services it every year and everything is still in good shape. The only issue is that the key switch had gone out. He wants $4400. Is this a decent price? Is there anything I need to pay close attention to before I buy? How expensive would it be to have the key switch replaced? Any advice or suggestions would be appreciated. Thanks!