I have a D2 with a SD roof rack. I have looked into putting a LED bar up top, and decided against it. Looking more towards some Hella Rallye or IPF round lights across the top and then maybe a short LED bar on my winch bumper. Another idea I had was an LED bar across the back instead of a work light, but have a spare Piaa in the garage.
Just my opinion, but I seems hard to beat a D1 or D2 running large round "Rallye" lights on the roof rack, ESP when you throw on a set of limb risers... To me, that is the classic look and fit for our discos. Also, as Medical Cowboy said earlier, be sure of what LED lights you are getting. The lights seem to be getting brighter and prices more reasonable making them hard to pass on.
With all that said, either way is functional and looks fine. At least around here in middle Tennessee, there are not any discos around that look stupid and over accessorized like other 4x4's.