The older Jiffy's are better than the newer Jiffy's (in my opinion), I have owned and used both.
The newer Strikemasters are better than the older Strikemasters again in my opinion, I have owned and used both.
The Eskimo Propane is a sweet machine, I know that you were leaning away from Propane, however: The Eskimo Propane motor was designed from the ground up as a propane motor. When you convert a gas motor to propane as in what Jiffy did, you lose about 25% of your horsepower. Propane burns hotter than gasoline, a converted motor runs the risk of meltdowns. The Eskimo is a High Compression, High Output lightweight 40cc propane auger. It has steel handles, stainless steel gears and ball bearings in the transmission, not bushings. The Eskimo auger has the Quantum cutting system which is the best auger there is for re-drilling old holes. Propane has virtually no exhaust, no gas and oil to mix, and you don't have to winterize your motor in the spring. You can leave the propane tank attached to your auger, hang it up in the spring, and pull it down again in the fall. I can tell you that at the recent ice fishing shows, Propane Eskimo Augers were outselling others 5 to 1. And they can be had for right around $400.
1.Jiffy Pro4 with 8" and 10" runs great just to dang heavy.
2.SM 8" laser mag great auger does what it should.
3.Nils 8" light weight and ice eating machine as long as you take care of the head(blades)
If you are going to drill lots of holes outside then a lightweight 2 stroke auger is the best way to go. I Have the Strikemaster Laser Pro 3hp for that.
If you are going to drill just a handful of 8" holes, electric augers (Like the Electra) work great.
For drilling larger 10" in my ice castle I have a big volt electric.
I have not tried any of the ion battery augers yet. They have more power than a standard battery but I am not sure how well they hold a charge in really cold weather.