How much to spend

Cmac owner i’m 0-2 because i’m also a kittle and godwin owner and mark ingram is my next best rb so i’m in trouble. The saquon owner is also 0-2 and desperate as well how much fab should I spend? 12 team league and my next best rbs are snell akers michel and duke johnson so none playable atm. 40 bucks 50? 60? Not sure what do I have to have him. Freeman is already owed so davis will be the biggest difference.