The Toro model 20384 will do just fine for your situation. Your worries are unfounded. It will handle backing up and turning better than any of your other choices. I recommend you do your own yearly maintenance, except blade sharpening, which would only cost about $25/ year. Yes, I know it costs $700 MSRP when you can't find it on sale, but with proper care I tell my customers they can get 15-20 years use out of the cast deck personal pace mowers. On sale they should be between $625-650.