If you haven't checked out the Baja Designs LP6 yet you really should - the Trek Truck Discovery 5's had those and the bigger LP9 lights and they are amazing.
I'm planning on replacing my Hella 4000's with a par of LP6's - thought about the LP9's but think the LP6 size is better matched with the ARB.
Here's the Hella 4000's on my D90