I thought the same thing about the Gerber/Fiskars, and bought one. I spent an hour one day limbing some pine boughs, about .5" to 1.5", and when I was done the edge was chipped, rolled, and generally abused. Metal that get's that abused from knots in 1" pine boughs is suspect, to me. I gave the same treatment to a Busse Paul's Hatchet, and it was shaving sharp afterwards, with not even the faintest roll, as a matter of comparison.
The handle of the little Gerber is very comfortable, but I have heard many stories of them breaking. They are just thin walled plastic tubes after all. If Murphy's gonna get you, he's gonna have fun if you get the Gerber. It does make a nice little yard axe though, so I don't regret buying it. I'd just never recommend one to someone who may have to depend on it.
The Ranger Knives RD Hawk at 12" over all and a 3.5" edge may be a good choice for you, or take a look at K-5 Tactical for their upcoming line of "lighter" hawks. I'm looking forward to those immensely. They may exceed your $100 ceiling, but I honestly think that they are right on the money.
Finally, I actually carried a Kerwhaw 1018 camp hatchet in Afghanistan, similar to the Estwing you mentioned. I did a good bit of hardwood chopping with it, and it held up very well. It fits in a bug-out-bag nicely, comes with a decent plastic sheath, and it's $60 to $70 cheaper than the RDHawk and probably $100 cheaper than the K-5. But you pay for a level of confidence and additional versatility in the RK or K-5 products that you just won't get from Kershaw or Estwing.
edited to add: I'd also argue that the Kershaw and Estwing handles will be much more comfortable than what you typically find on 1-piece hawks, something to consider if you plan on using it more for utility than tactical purposes. And what is tactical anyway: A Gransfors Bruks is as tactical for an outdoorsman as an ATC Hawk is to an infantryman. Don't let the mall ninjas define tactical for you.