It might just be me, but personally I don't understand what is so bad about plain old Rocks. Everything I've ever hammered (except at work where I'm forced to use other) has been done by Rocks (or, if I'm feeling in the mood to have some recessed nails, convex rocks) and I've never had any issues.
Why spend so long worrying about your Hammer of choice when they are all effectively glorified Rocks?