Playoffs for NL ONLY fantasy league advice

My big issue here is, I've NEVER played in an NL only league, just mixed.

I've made it to the playoffs on bulls**t and luck so far.  I lost Jose Fernandez, Matt Cain, Timmy Lincecum, Charlie Morton and Pedro Alvarez to injuries and/or sucking.

But I need some advice because I am going against a buzzsaw this week.  

I'm already 100% starting Jordan Zimmermann, Gerrit Cole and Frankie Liriano.  I am also starting Santiago Casilla as one of my RP's.

Now who should my other SP's be (I need two more.)

Mike Leake vs. STL, @ MIL
Tyler Matzek @ NYM
Josh Collmenter @ SF
Eric Stults @ZONA

Dillion Gee @WASH
Jorge De La Rosa @STL

^Yes, all of those are extremely tough starts, hence my enlisting of help!

And then one RP needed

I have Trevor Rosenthal and Kevin Quackenbush.  

Obviously Rosenthal is the rational choice, but he appeared in all but two games last week, making me wonder if they rest him to start the week, and possibly to end it seeing that they have seven games the next week after.  

I was thinking to go with Casilla and Collmenter (who serves as a RP, SP option) in my other RP slot.  Quackenbush is suspect because he's not a closer, and who knows when Benoit comes back.

Help me Covers.  Adam Hyzdu's Wise Few's dynasty depends on it!