Awesome, congrats!
Yes, once you go with bi-xenon's or bi-LED's, the stock halogens(which I never understood MBZ included halogens on such an expensive truck anyways!) are poor. The only issue with the LED's is if you drive in a lot of snow/ice, the LED's are so cool they won't melt the snow/ice.
It'd be pretty straight forward to do a Rigid bar on top of the lower horizontal bar, where the 2 fasteners are pre-installed for aux light location. I've of course noticed in the fog/blizzard snow my 50" makes driving much more difficult, so I'd need to add a Rigid on the brush guard with an amber cover for fog use. Thankfully it's usually not that foggy in OR.
Any chance you will mount your additional Rigid bar on the bull bar in the coming weeks? Any chance I could buy whatever brackets you develop to mount mine?? Maybe get them installed on the 20th?