Have got 4 "spots" on top of the landy, cant see why you would want one great big one...
The idea of the combo is to penetrate further ahead (spot) but give a decent amount of light around you to navigate by (flood)
never having looked, as decent light bars are expensive, and more affordable ones too much of a gamble imo I presume you can usually switch the spot and flood independatly??
Just a spot is going to be of limited use IMO.