Hey Gang, I was wondering what you guys thought was probably 'too much' lawn for a walk behind self propelled mower? I THINK I'm right on the cusp of possibly being too much to walk but too little to ride. I'm debating buying either a Snapper Hi-Vac Self Propelled w/ the Briggs 8.75 or a Snapper RER 28" w/ the Briggs Intek 12.5. How much grass goes from 'this walk behind is perfect' to 'OMG I've spent 1.5 hours walking around my yard'? I don't want to over-buy, but I also don't want buyer's remorse !!! Thanks in advance !!!