RKA: 15 points per die.
No Range (-1/2) makes that 10 points per die.
If you use an HKA: 15 points per die.
You'd have to use "Str doesn't Add" (-1/2) to make things cost the same and be the same.
So, we have RKA, no Range, and HKA, Str doesn't add, both for 10 points per die. (barring any other modifiers).
So, since they cost the same, you have to look at which one better represents the SFX of the situation.
For a lot of SFX, Steve feels that RKA, no range fits better (it's the energy of the blade that does damage, not the person swinging it in the light sabre example. Rest the light sabre on the table, it'll still cut. Do that with your sword, and, well, you'll have a sword lying on the table.)
HKA implies, to me at least, that you're using your STR with the item, like Wolverine's Claws or Black Knight's Sword. So, I like Steve's way. 
If the STR doesn't matter, where the damage stays the same no matter who's using it, then it doesn't matter which method you use, because it costs the same.
If STR does matter, then go with the HKA, and forget the Str doesn't add, and rock and roll.
D
Nathan, after rolling his 6th consecutive 15+, crosses out the name on his character sheet, "I'm now Chris, the Gestalt of Incompetence."
Chris, sitting next to him, "Grrr."
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