For a hard top tonneau cover, the ARE LSII or the Leer 700-series are good ones. They're the only lids made that have the raise center "hump" section which match the lines of the Titan.
The flat covers don't look bad on crew cabs, but the KC's look much better with an ARE LSII or Leer 700-series IMO. In addition, the flat "fiberglass" covers don't have the structural "honey-comb" reinforcement section through the middle secion of the lid. Only the ARE LSII and Leer 700-series have the structural reinforcement through the center section as well.
I have the Leer 700-series on mine and I'm very pleased with it. I originally wanted to get the Undercover hard lid, but they don't make them for the KC Titan's. Anyway, I'm kind of glad I got the Leer instead. It looks like a factory made option from Nissan. The paint quality is great and it matches perfectly, the lock mechanism is hidden behind a stylish flip-up cover, the underside is covered with a soft felt-like material and water never gets inside the bed.
