The Flash #29 is a slow and steady climb towards a new Big Bad that we have yet to meet, and an in-depth look at new powers Barry has yet to understand.
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Christian Duce
The Flash #52 deals with both the Speed Force and the Strength Force, and is helped along greatly by Christian Duce's artwork.
The Flash #32 re-introduces us to Iron Heights and sets the scene for Barry Allen's future dealings there while igniting plot points that will go off later.
The first Flash Annual of the post-Rebirth era plants the seeds for Flash War, first by peeking into Wally West's life since his return and by exploring the tension between him and Barry.
The Flash #45 is a nice break between major story arcs, but it's not lacking in either heart or hype. The long-awaited reunion between Iris and Wally brings not only tears of joy, but also important revelations that set up Flash War. nicely.