Yes, I'm aware of that. I'm asking what you should set the wand caster level as for a low level spell to get the best price to damage ratio. Setting a lesser acid orb to CL 9, gives 5d8 damage on a ranged touch attack, average 22.5, no SR, no save. For Magic Missile, you can set it at CL 9 for 17.5 average, but autohit and a force effect, SR applies. For Shocking Grasp, you can set it at 5th level, for 17.5 average, no Save, SR applies. For Melf's Acid Arrow, you can set it to CL 6, for total 6d4, average 15, plus concentration checks, no SR, no Save, on a ranged touch. Produce Flame is also good.
Some of these spells scale better than the higher level spells. Take Searing Light, for example. Against normal creatures at CL 6 it does 3d8, no Save. Against undead, 6d6, no Save, but SR applies. Still, a charge from that wand costs 6x3=18x15=270 gp, while the Lesser Acid Orb charge costs half that for more damage. Sure Searing Light is untyped.
So, I'm really wondering which is the best for a rogue-type with high Use Magic Device against undead and other sneak attack immune creatures.
Pinotage