QB trade help for week 8 and beyond

I have 3 QB’s on my roster and cant decide if i should keep them for matchups or trade one to get stronger at WR/RB. I have Stafford, Mariota, and Watson. Any suggestions for players to target with trades or should I keep them all? below is my roster 12 team standard espn league:

QB: listed above
RB:M Gorden, C Thompson, B Powell, Matt Breida
WR:Cook, Pryor, Agholor
TE: D Walker, Kittle
DST:Jags and Ravens

Man you probably should go for a better WR. I like Watson so I would keep him and try and trade one of the others for a higher end WR