@Darenix: I would aim for a better one, but I have seen people practice witn bad weapons and actually make them pretty good. Just try it out and see how you like it.
Aurum Palm: The Cont. Fire is really good. Standing, Foward, and Backward Cont Fire leaves you with the best chance of actually hitting your opponent. The Charge Shot shoot in a straight line, so you have to have pretty good aim or equip the power Autorectile.
Aurum Bow: Has great homing and range iirc. Pretty easy to get comfortable with.
Aurum Orbitors: I dont really know much about these.
Aurum Blade: I know it has pretty poor Range, so Shot Range +2 or +3 is needed. Not sure about the homing and whatnot.
Aurum Club: Good Range and decent Homing. Huge Charge Shots make it somewhat easy to hit your opponent.