I'd stay away from KC. Division rival, primetime game, weird things happen. They have easier home games later this season.
Philly is obviously a good option if you still have them. They have Chicago in a couple weeks which would be another time to take them but other than that don't really have too many other opportunities for them. I would be taking them if I had them but I don't.
This year is stranger than most due to all the upsets so participant counts are lower than they normally are this time of year. Which means (at least to me) that you should be placing less emphasis on future value on more value on just taking the best option to survive and advance. Unfortunately, its really hard not to look ahead to see what the future schedules are and who you may want to be taking in a few weeks.
So for the rest of the season the following are projected spreads of 7 or higher each week (or the highest spread if there is not a 7 or above):
Week 8: Philly v SF; Cincy v Indy; NE v LAC; NO v Chicago; KC v Denver; Minny @ Cleveland (London game)
Week 9: Houston v. Indy (only one over 7, next bests would be NO v TB and Sea v Wash)
Week 10: Pitt @ Indy; Detroit v Cleveland
Week 11: nobody currently over seven, next bests are KC @ NYG, NE v Oakland; Pit v Ten, Den v. Cincy; NO v Wash
Week12: Phi v Chicago; Cincy v Cleveland, NE v Miami, KC v Buffalo; Sea @ SF; ATL v. Tampa
Week 13: KC @ NYJ; LAC v Cleveland; Jax v. Indy
Week 14: NE @ Miami; Cincy v. Chicago; KC v. Oak, Pit v. Bal, Buff v. Indy, Hou v SF, Den v NYJ
Week 15: NO v NYJ; KC v LAC; Detroit v. Chicago
Week 16: NE v Buffalo; KC v. Miami
Week 17: NE v NYJ; Minny v. Chicago, Sea v Zona, Pit v. Cleveland, LAR v. SF
Hopefully that helps some map out the remaining season if that is your thing. I tend to do it in small amounts, like I won't be taking NO this week because week 15 looks like slim pickens and they will be the best option that week.
I am deciding between Minny and Cincy this week. I don't like messing with London, but that usually tends to favor the favorite. In the other three London games this year, the Saints crushed, the Jags crushed, and the Rams crushed. Looking ahead I only see them in Week 17 as another good option. Not sure the league makes it until then. Cincy is home vs. what I think may be the worst team in the league (they only have two wins because they got the other two really bad teams at home). Problem with using them is they are going to likely be the biggest favorite in Week 12 and I would like to have them at that time. But that is also the problem of looking too far ahead.
So, still deciding, but for me its either Minny or Cincy, but I would take Philly if I had them available.