the H7 foglight mod, so I've heard, actually makes foggy driving WORSE. When you remove the diffuser inside the fog lights, the light does not aim towards the ground anymore, it just "scatters" the light all over the place. It gives off the illusion that it is brighter when in reality it just has light going all over. And when in fog.....thats not good! However, since you do live in a rural area, i'd assume that you want as much light as possible so i'd give it a go!
Another thing you can do for brighter lights is the 9005 to 9006 conversion.
http://www.bmwe34.net/E34main/Upgrade/More_light.htm
I purchased some aftermarket sylvania 9005 bulbs and modified it to fit the 9006 socket. A VERY VERY nice white, bright light which illuminates the road MUCH MUCH better. The 9005 bulbs have 1700 lumens, 9006 have 1000.
Or, just go with HID. Once you go HID, there's no turning back. Its best to purchase european projector headlights, best brands being Hella and ZKW, Depo and DJAuto and Inpro are all inferior but still can do the job. Then all you need are HIDs and you're set. But that runs around $700.