PC On 2 Max Damage Purple Hammers...

Runic Hammer (PURPLE)
DMG: 19-35 (Req. 13 Hammer Mastery)
Damage +11% While Enchanted

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Warhammer of Enchanting (PURPLE)
DMG: 19-35 (Req. 11 Hammer Mastery)
Damage +11% When health above 50%
Enhancements last 11% Longer

http://img233.imageshack.us/my.php?image=hammers2lv.png

Merchant all purple hammers, always.

The only exception is to salvage those with perfect mods.

In which case they will be gold....

Everything Purple should be merchanted unless its a rare skin.