I have the Estwing 16" Camper's Axe. I don't know if this size is good for you or if you're looking for more of a 13" or so hatchet, but I highly recommend it. The edge retention is great and it is pretty simple to sharpen. I like the cushioned handle for when I'm really laying into bigger branches. It's much more comfortable than a wood handle in my opinion. I've read people saying they think the steel shaft of the Estwing actually may be weaker than a wood hatchet, but I don't buy that. It flares/thickens to the center of the shaft, effectively giving it much, much more strength than at first glance. You said you like Estwing hammers, so I am assuming you know what I mean...they use a similar design for those too. If not, I can clarify.
Other factors that may or may not be on your list...I liked that it is made in the USA. Also after use, it seems to be very rust resistant. I haven't seen even a hint of corrosion yet (I even left it laying in the grass overnight one time). The sheath, while not made in the USA, is far superior to the Wetterlings sheath (I used to own one but sold it). It has 2 snaps as opposed to 1, and the Wetterlings retention strap had to be just so in order to stay on. My only complaint - and this goes for both sheaths - is they aren't comfortable to wear on the belt. I got a hammer loop from Sears and just hang the axe in there. Works great for just a couple dollars.
Also, again comparing to the Wetterlings, the Estwing's steel is very smooth, which allows it to drive through wood more easily and cleanly. To be fair, I never used the Wetterlings, but the finish of the steel was very rough and seemed as though it could easily catch and drag in wood.
The one complaint I have about the Estwing axe itself is it didn't come very sharp. However, if you plan on using it extensively, you're gonna have to sharpen it eventually anyway.
Bottom line is you really can't go wrong with the $40-$50 price tag of the Estwing.