I can't speak to the size of a tiller to get but here is my experience. About 5 years ago I wanted to replace about 3/4 acre lawn in our old house. The quotes I got were 'knock your socks off' high. I bought a Simca 5' reverse rotation tiller. The ground hadn't been touched in 20 years so before tilling I used a box blade with rippers deep to loosen up the ground first. That allowed me to remove the big New England potatoes before using the tiller.
The tiller was awesome. I did a cross-hatch pattern of tilling and the soil was fluffy soft when finished. I then tilled in 2000lbs of limestone and 250lbs of fertilizer.
The lawn came up better than I ever could have imagined. The tiller was indispensable. I sold it a few months later. I had no more use for it.
From my way of thinking if you need it, get it. Sometimes there are no practical substitutes.
The tiller was awesome. I did a cross-hatch pattern of tilling and the soil was fluffy soft when finished. I then tilled in 2000lbs of limestone and 250lbs of fertilizer.
The lawn came up better than I ever could have imagined. The tiller was indispensable. I sold it a few months later. I had no more use for it.
From my way of thinking if you need it, get it. Sometimes there are no practical substitutes.