Smith should hopefully have a pretty good game against KC, go with him.
As for TE, Vernon Davis is becoming a must start, but Clark's always been a must start...in the battle of the must-start studs, go with consistency (i.e., Clark) until Davis proves otherwise.
(0.5 PPR, 12-team league)
QB: Vick, RG3
RB: McFadden, Matthews, K. Smith, R. Williams, M. Goodson
WR: Nicks, S. Smith, Britt, LaFell
TE: Hernandez, Pitta
DEF: Spot start (Cin in wk4)