I want to run factory head lights on dim with auxiliary driving/fog lights
A driving light is for use with high beams because their light pattern has no cut off at the top for oncoming traffic.
Fogs do have the cut off needed to stay on with lows however a fog beam is wide and doesn't throw near as far as even you oem lows do.
then when I switch to bights I want to have the driving/fogs go off and have set of brighter lights to help out with the factory bights. Keep in mind I don't want to go to bright and still want to keep it safe for oncoming traffic and have only 4 lights on at a time.
Sounds exactly what I am currently working on.
The oem lights are awful and I want as much improvement as possible but. .
1) Only 4 lamps at a time to keep legal
2) The lamps with low beam must have proper cut off
3) The lamps with high beam must not be overkill as they will be scene from a distance and the occasional flash to get others to dim
4) In my state they must be between 16" to 42" above ground
1) Is easily done with relays into your oem wiring
2) For this you will need a fog beam or one of the low beam alternatives I linked to in the 55w range
3) I feel a 100w driving beam should be ok. Lumen output will be less than HID's and if you stay away from bulbs that emit blue color you won't be noticed as much.
4) Your bumper mounts should be right in that range.