Most of our lawns are tiny and perched at the bottom of many stairs. Any suggestions for a real light mower? Right now I'm running a super light Craftsman push 21". I find the self propelled models add at least enough pounds to break my back on these hills. But, I'd like to step up from Craftsman obviously, something with some suction maybe, and nothing else is even close to as light. What do you guys do about stairs? He who has contracts loves the drought.