Just jack....
I tried a push reel mower one year. The problem is, you must have nearly pperfect lawn for those to work well, in my experience. Crab grass lies too low and spread out. Sticks, debris, roots, uneven turf will stop you dead in your tracks. And who the heck is gonna clean and oil the blades after every use?! I hope it works out for you though. The cost and environmental benefits are admirable.