I've got the Cold Steel Norsemans hawk. I've had it four or five years now I guess. Very durable, very versatile, too. I use it to trim overgrown branches, fell smallish trees, target throwing, etc. I took a leather "string" and wrapped the handle along the last several inches of the handle to get a better grip on it.
although, tomahawk is a bit of a misnomer for the norseman, as it doesn't have the counterweight opposite the blade, so it's really closer to a hatchet than a 'hawk.