If you go with a rotary mower you might look into one of these:
Good quality cutter that's ok on the wallet:
Rotary Cutters Single Spindle Squealer
These last two are two cutters are tough and should last you the rest of your life no matter what you throw at them as long as you store them properly and keep oil in the gearboxes.
Rotary Cutters single spindle 280 Series
Bush-Whackerｮ - Single Spindle Mowers- 6010 Heavy Duty 5-Foot Rotary Mower
