Hi,
On the classic records, I think Maiden were using DiMarzio Super Distortions. They have ceramic magnets and a DC Resistance of 13.68k. These days they are using Seymour Duncan JB Jr and Hot Rails. Bareknuckle don't do single coil size humbuckers, but I think full size ones tend to sound a lot better anyway. Those Seymours are about 16k and also ceramic.
I'd think your best bets from the Bareknuckle line would be (in order of preference) Holy Diver, Cold Sweat, and Nail Bomb. By all accounts, they are great metal pickups that can also do clean.