If anyone is interested in non-resistor plugs for the EJ25...
I wound up ordering the NGK R5671A-11, #6596 - it is the V-Groove racing plugs and they should fit perfectly. The total for 4 is about $15 delivered.
The response I got from NGK is that the only plug avail in the states for the EJ25 they make that are intended for a Subaru is the NGK BCP5ES, #7496 - that is a standard geometry non-resistor plug. These are only a couple $ a piece too.
Both of the above can be ordered through any local car parts store.