The question is very general.....You may want to be more specific?...
I'm assuming you don't have to pull it with your truck?... and Is candlepower your only parameter or distance throw, does cost matter, or size, or weight, and does it need to be practice.... etc?
There is some nice inexpensive stuff and some nice expensive stuff... most of the really bright stuff has been modded in some fashion... Larry makes one that only burns about 5 minutes but is stinkin bright till your steak is done!