I chose the Sealey brand for its No Quibble Lifetime Guarantee on all its hand tools. (Don't you just love the word Quibble by the way). I love it when companies say this, as it tells me they are confident in the durability of their products.
I have been encouraged by the reviews I have read of their products and I'm happy to say they aren't even the most expensive brand out there.
Here's the serious product description part:
Hammer head and shaft drop -forged from one piece of steel.
Lightweight yet incredibly strong.
Manufactured and tested to BS 876.
Model number CLX16