metz12, you could be right. I don't know the mans physical conditioning so a rider may be his only option. But taking from the details from his initial statement he has used a 21" mower in the past. As far as mowing in circles, no one with any type of mower has to go in circles as long as they have a reverse. But he is looking for the fastest way to mow this small yard. Finally to the $1000 budget. Instead of getting a used mower he could acquire everything new. He made it clear that he would not be able to work on any used machines. So as long as he is not in terrible physical shape including having lazy bones in his body then a 21" would be the fastest and most cost effective way to approach this particular yard.