I'd recommend going with 2 driving in the middle and 2 fogs a side.
I have 5 Hella 500 on the roof (3 driving and 2 fogs). Driving are great for high distance lighting while side fogs give me great visibility on the front corners. In my perspective this is the best option. Unless you do high speed desert racing where I'd recommend going 4 driving as you drive fast and need as much light as possible far upfront of you.

'05 4Runner V6
5" Custom L-T Lift, 35" MT+AT, ARB / CBI bumpers, 4.56, Snorkel, Custom RoofRack
'01 4Runner V6
3.5", 33" AT, ARB / CBI bumpers, Snorkel
'74 Land Cruiser FJ40
... New Project...
'09 Off-Road Trailer
Custom build, 35" MT