The Helmet is a nice Defense upgrade for your Warrior, and it's quite cheap. You will find one later when you have the Mystic Key, along with the superior Grand Helm, but don't wait. Your Warrior needs all the Defense he can get!
The Wooden Helmet is a nice Absorb upgrade for your FIGHTER, and it's quite cheap. You will find one later when you have the mystic KEY, along with the superior Iron Helmet, but don't wait—it's only 50 G!