*Stabs*

Anyway,

Fire Shield:Just for regular ownage. Low spread and reach, but immense damage.
Water Shield:Works well in a crowded area. *Bubble bubble*
Plasma Shield:Works well in any occasion. Higher reach and spread than Fire Shield, also great damage.
Laser Shield:No spread, EXTREME RANGE AND DAMAGE! Too bad the Shield doesn't work without cheats.
Trafton Shield:Will protect you with his full body... OWNAGE!!!