Fantasy Football Roster ?

[jack]

Here's my current roster for this week, can I have your opinion on it (Salary Cap Fantasy Football on Yahoo, where you get $100 for 9 roster spots)

QB--Matt Cassel vs Denver ($1.89)
RB--Marion Barber @STL ($18.82)
RB--Chris Johnson (TEN) @KC ($9.15)
WR--Jericho Cotchery @OAK ($11.33)
WR--Antwaan Randle El vs CLE ($7.30)
WR--Devin Hester vs MIN ($4.92)
TE--Jason Witten @STL ($11.85)
K--Robbie Gould vs MIN ($15.01)
DEF--Tennessee @KC ($19.31)
LEFTOVER MONEY--$0.42

My biggest question--Should I keep Matt Cassel or mix up my roster to get some more expensive QB like Jay Cutler