Although the Stamina set looks enticing with the Stamina gain, it's not the best. The stats (TDD) and bonus that it provides is only beneficial for physical-attack players.
It's better to get the Mana set since the bonus will help. You'll want to try to do Luck + Stamina on all your gears (except glove and shoes). Shoes would be Movement Speed and gloves would be Magic Critical Damage.