There is a lot this year:
JGR with matt kenseth especially is dominating.
Carl Edwards id showing strides of 2011 once again
JJ and Harvick are always the closers to watch out for, but Now men like Kurt Busch making a resurgence...
Bowyer as usual is a jackass

and a damn good driver too; always in the fray.
Most of the teams are competitive, so it amounts to luck as well.
my chase contender list based on what I seeing
JJ
Carl Edwards
Boyer
Kenseth
Kurt Busch
Kyle Busch
Khane
Harvick
Keselowski (even with penalty)
Stenhouse
Wildcard - Logano
Wildcard2 - Gordon