Stafford/Colston for Peyton Manning/Decker WHIR

[bdk140]

12 Team PPR with superflex
my team
http://i.imgur.com/ytaC9.png

Don't know about you guys but Stafford is killing it for me and I really don't see him anywhere near the numbers he had last year, and see him at the latter end of the top 10. I like manning's schedule down the road, especially in the playoffs, but am I abandoning ship too early and giving too much? I could get Decker or Antonio Brown and they feel equivalent to me. Any thoughts?