DP flex spot--Who's best?

Thanks for the insight so far Ryan!  
I'm dropping Babs tonight and will pickup Harrison Smith or William Moore (or Kurt Coleman if the other two are already picked up) for my S spot.
Does that picking order sound about right to  you?  (not sure if smith is better than moore past this week....)

I have a flex spot and am looking for production for the season, not just this week.  Who do you recommend:

Porter
Sean Phillips
AJ Hawk
Kelvin Sheppard
Nicholas
Dont'a Hightower
Foote
or perhaps a Safety would be best for more points?
If I pick up smith, then I could pick up moore, or dahl for this flex spot...

It's pretty standard scoring
tackle: 1
assist: .5
sack: 4
PD: 1
stuff: 1
int: 4
ff: 3

I have Colin McCarthy usually in that spot, so I'll bench him until his status is clearer.

I dropped babs and picked up Harrison Smith AND William Moore.
I'll play both this week, unless you think Kelvin Sheppard will do better.  I can pick him up if McCarthy is out for the week.

If you had to drop smith or moore for sheppard though, which would you drop?

McCarthy is out, so I picked up Sheppard....so now trying to decide between Sheppard, Moore, and Smith.  I only have two spots...opinions on the best 2?

I don't like Sheppard a lot this week as the Chiefs use spread sets and he may not be on the field for more than 30-40 snaps as a result. I'd go with the DBs you have.