I am having trouble finding out what the differences between the smoke hallow models the 31062e 30166e, 30166e-m, 30167e, 30168e. They seem to be just yearly incremental name changes, but there are tons of 30162e for sale everywhere, very few 30166e for sale(menards has them, is that what the "m" is for?), and the 30168e is on sale at many places like home depot. The 30168e seems the logical choice as it seems to be the newest. But the 30166e-m can be had much cheaper while the 30162e is the same price as the 30168e. What are the differences, are any better then the others? Online they look the same with slightly different handles? Anyone know?