I went with a 100$ ~40" 300w unit from Amazon. Has worked great. I mounted at the edge of the roof. It basically makes the factory lights insignificant. I set two 1/4-20 rivnuts in the roof for mounting.
The only caveat is you need to double check the wire entry and glass seals. Mine needed sealant on the wire entry, as it pulled a bit of moisture in through there at first.