Considering the only things you can add that will be street legal will be fog lights I'll make a suggestion.
If you go with fogs get them from a good company with an actual fog pattern. Also they work best in a yellow or orange is color.
But, If you find yourself driving on the highway at night a lot where you only pass one car an hour and its free range black Angus then I have a great setup.
I mounted a pair of high intensity discharge (h.i.d) off road lights. They are relayed off of my bright switch and through their own master switch. This allows me to turn them on only when on a empty road but if an un expected car pops up I can quickly dim with dimmer switch so not to blind a oncoming driver while I look for the master switch.
As far as lights are concerned for pattern you would want a driving beam to light up the ditches and road or spot pattern if you just want to see for a mile down the road. You do not want super bright led floods for two reasons. First you will create such a bright area around your vehicle that you will loose your night vision and your ability to see further down the road. Second you will have light bounce off of every light colored object and reflective sign. It will feel like you have lights pointed in your eyes.
There is a reason why led's are not typically used as headlights for high speed driving. The light from them doesn't travel the distance down the road that other technologies do.
The absolute best lights for driving at speed are h.i.d.
The downside to hid is if they have been turned off long enough to cool down it takes a few seconds of "warm up" to reach peak brightness. Similar to a florescent a.c. fixture.
Also $$$$
