With a 36" width, you would have a tough time finding a fixture that is mostly LED as the main lighting that will cover the entire area, outside of doing RB modules, the Cannon's assuming you could get them high enough, or the Vertex Illumina which is not available in the states yet.
The new Giesemann Helios fixture is one of the nicest hybrids on the market, although it does have a hefty price tag. You would have to be cautious with coral placement as well, depending on where the fixture as, as the LED's are not going to give you terrific spread front to back in that 36" width.
The new Coralvue hybrid T5 is a really nice fixture, but again, the LED's are just a single strip down the middle that would be good for a little bit of moonlighting on that size tank, and that's it.