If you want something in the stock location, the best performing alternative would be to grind off the mounting studs and fabricate a mount for a pair of Cibie or Hella foglights. Wire them directly to the battery using a fused/relayed harness and one of the stock wires to trip the relay.
It would work TONS better than any sort of bulb swap.
But the easiest, cheapest, and most effective thing to do (and I guess you've already considered it anyhow), is just mount a pair of aftermarket lights on the bumper.
I recommend the Hella 4000s for best value/performance.
And for more overall light and an way to obviate the need for "foglights" in the first place, replace your H13 headlight housings with a pair of Cibie H4 housings from Daniel Stern Lighting & Consultancy. Put in a pair of Osram 70/65 bulbs and buy a wiring harness pre-fabbed from Rallylights.com. This 45 minute mod will more than double your headlight lumen output; the color temperature is optimal for human sight and the throw is outstanding. Those lightbulbs tend to only last 6 months or so; the price for quality light...
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Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.- Helen Keller