Is it a gpp contest you qualified for? In other words it will have a lot of entrants? If so, there's 2 things to keep in mind imo.
First, leave some salary on the table. Not a lot, but if you spend every dollar available the odds skyrocket of you having the same lineup as a lot of other people. The key in the big gpp tourneys is to try to find a way to be a little different.
Second, take fighters with high FS upside. DK prices the fighters purely based on ML odds. But a heavily favored fighter with low finishing upside who won't get TD's won't win you a gpp. Focus on fights with a high likelihood of an early finish. You're gonna have to get at least 2 underdogs in your lineup to make the salary cap work. So you might as well focus on dogs that IF they win, they score huge. Guskov stands out. Lane would be another, if you think he has a shot.
The few gpp's I won big prizes on, the lineups all were constructed that way.