I'm not sure what kind of driving you do, is it fast driving or slow? If it's slow, I'd personally go for more spread. If it's relatively fast, I'd go for a combination of pencil beams and a light that spreads out in front of the vehicle to give you adequate illumination up and down and side to side.
I being a "kabaria" at heart, would probably try to re-use old truck type headlamps, aircraft landing lights or ones from locomotives. I'll remove the filament bulbs and retrofit the HID bulbs. Then I'd shim the bulb to find a good focus. This is potentially a cheaper solution than to go for a ready-made off-road light set from PIAA or Hella. The downside is that you'll have to work hard to make your own mounts and focus each lamp to your liking. You'll have something entirely unique though!
HID bulbs these days are producing in the region of 3500 lumens of light for 35 watts. If you put in 4 lamps, you've got around 14k of light for around 140 Watts of electrical power. This is pretty much illegal on the road though, as normal headlights are in the region of 4K lumens total on the road if my memory serves me right.
I've seen LED off-road lights as well, but they've got their own tradeoffs:
Pros (LED)
1. Instant on
2. Robust
3. Low voltage circuits
4. Almost unlimited life
Cons (LED)
1. Expensive (900 Lumen SSC P7 quad-die LED costs in the region of US$20
2. Need a driver to control current.
3. Heat dissipation is a must, the mounts on which the LEDs are mounted will have to dissipate heat from the back
4. Not a very high lumen / surface are rating, so the light will be good for flood lighting, but not so good for long distance lights.
As a side note, I've modified a Maglite 2D with the 900-1000 Lumen LED. Out the front I'm guessing I'm getting around 7-750 Lumens. It uses two Li-ion cells and has a buck convertor to limit current. It is bright!! You can quite easily illuminate and identify things at 100 metres. Plus it's relatively warm colour so you do not get that blue / purple tinge characteristic to so many LEDs. The LED plus the convertor cost me in the region of US$60. I've got just over a hundred tied into the light, but it's good investment for me. If we ever meet, I'll lend it to you to test it on the trail 
If you're interested in the LED solution, let me know, and I'll give you some more info.