Troy-Bilt TB154E Electric Tiller/Cultivator
If you are looking for one of the most versatile tillers on the list, welcome to the Troy-Bilt (6-12") 6.5-Amp Electric Forward Rotating Front Tine Cultivator. Although it's rated as a 12 inch tiller, you can remove half the tines and use it as a six inch tiller. That allows you to get into places where others cannot go.
It's the heaviest tiller here, at 35 pounds, but gives you a bit more leverage when breaking up compacted soil. It has a three depth position adjustment, and will till down to eight inches deep. This is a good choice for smaller and medium sized gardens, with the added versatility of weeding between rows by removing one set of tines. It comes with a 2 year warranty.