We recently got a chance to use some Hart Hammers and must say we are impressed.  Apart from a lifetime warranty they have some signature features that set them part from the rest of the pack.  Features like the ability to hammer on the side of the head in tight spaces and a 180 degree side nail puller.  In our tests the side nail puller worked well with long nails only.

Minimal vibration was felt as we drove in nails.  The waffle head design gripped and felt solid.  The Hart 21 oz. Milled Face Steel Framing is under $30 at Home Depot.  Check out Hart Hammers