should I add kevin porter junior for TJ McConell, or thaddeous young, or terrence ross?

I'm in a 10 team pts league and I'm in first place at 10-0 but am in a hard matchup I might lose and we do faab waivers on mondays, also if you think I should add any of them how much faab should I spend on him as right now I have 70 dollars and we started with 200. thank you in advance